The West Bengal Special Task Force (STF) has arrested Fazle Rabbi, the brother of former Trinamool Congress (TMC) Islampur block president Zakir Hossain, in connection with an ongoing investigation into an alleged espionage network with links to Pakistan’s Inter-Services Intelligence (ISI).

Rabbi was taken into custody from Uttar Dinajpur late Thursday night after investigators reportedly found his name emerging during the questioning of three men who had previously been arrested in connection with suspected espionage activities. The latest arrest has widened the scope of the investigation and raised questions about the extent of the alleged network operating across parts of West Bengal.

According to investigators, Rabbi’s name surfaced during the interrogation of Mohammad Shafiqul Islam, one of three men arrested earlier in the case. The STF is now examining Rabbi’s alleged contacts, communications and possible links with other suspects as part of its effort to determine whether he played any role in activities connected to the suspected spy network.

Rabbi’s family, however, has rejected the allegations. His wife, Nur Nehar Begum, claimed that her husband had been targeted because of his association with a senior TMC leader. She described the arrest as an act of political vendetta and maintained that Rabbi had been framed.

The allegations against Rabbi have not been established in court, and the investigation remains ongoing. Authorities are expected to examine evidence collected during the probe before determining the precise nature of his alleged involvement.

Arrest follows a series of espionage investigations

The arrest comes amid an intensified crackdown by the West Bengal STF on individuals suspected of having links with Pakistan-based intelligence networks. Over the past several weeks, investigators have arrested multiple people in cases involving alleged espionage, suspicious financial transactions, forged documents and the movement of sensitive information.

Earlier in the investigation, three men — Mohammad Shafiqul Islam from Uttar Dinajpur and Nur Nasiruddin Ali and Rashidul Haque from Cooch Behar — were arrested on allegations of operating under the cover of an organisation associated with the Army Welfare Education Society.

Investigators subsequently linked the case to a broader suspected network. Information obtained during the questioning of those arrested is believed to have helped investigators identify additional individuals who may have been connected to the alleged operation.

The STF has been examining whether the suspects were working independently or were part of a coordinated network allegedly receiving instructions or assistance from Pakistan-based handlers.

Probe expands after arrest of software engineer

The investigation also widened earlier this week with the arrest of Pradeep Basu, a software engineer from Delhi who is originally from Siliguri. Investigators suspect him of involvement in activities allegedly connected to a Pakistani espionage network.

Authorities have accused Basu of involvement in hawala transactions, counterfeit currency-related activities and the alleged supply of Indian SIM cards to Pakistan through Bangladesh. A court in Dinhata subsequently remanded him to eight days of police custody.

The allegations involving Basu form part of a larger investigation into suspected cross-border networks that authorities believe may have been used for financial operations, communications and the transfer of information.

Investigators are now attempting to establish whether the different suspects arrested in recent weeks were connected to one another and whether they had any direct communication with Pakistan-based handlers.

Pakistani national among key suspects

The investigation has also involved the arrest of Rana Rauf, also known as Wahab Alam, a Pakistani national who was arrested in Habra in North 24 Parganas earlier this month.

Investigators have alleged that Rauf had links with the ISI and was operating in India using a false identity. His arrest has become a significant part of the wider probe because authorities are examining his contacts and movements inside the country.

STF sources have also alleged that Rabbi was in contact with Rauf. Investigators are expected to scrutinise the nature and frequency of any such communication and determine whether it was connected to the activities under investigation.

The probe is likely to focus on digital communications, financial transactions, identity documents, travel records and contacts between the suspects to establish the structure and reach of the alleged network.

Earlier arrests provide leads to investigators

The latest developments follow several other arrests made by the West Bengal STF in recent weeks.

On July 31, investigators arrested Hamim Mondal from Renaissance Township in Burdwan. His girlfriend, Arpita Sarkar, was arrested from Jharkhand on August 1. Authorities have been examining their alleged links with Pakistan-based handlers and the possible role played by individuals associated with the wider network.

The investigation has also included allegations that some suspects were being directed to undertake activities designed to gather sensitive information or facilitate operations inside India. Investigators are working to establish whether those allegations are supported by documentary and digital evidence.

The arrests indicate that the STF is pursuing multiple leads rather than treating the case as an isolated incident.

National security concerns

The alleged espionage investigation has attracted attention because of the potential national security implications of suspected links between individuals in India and Pakistan’s intelligence establishment.

West Bengal’s geographical location, including its proximity to international borders and its connections with neighbouring countries, makes the state particularly important from a security perspective. Investigators in such cases typically examine possible routes for movement, communications, financial transfers and the acquisition or use of identity documents.

Authorities are also expected to determine whether the alleged network had access to sensitive information relating to security installations, defence establishments, border areas or other strategic infrastructure.

At this stage, however, the precise nature of the information allegedly exchanged by the suspects has not been conclusively established publicly.

Political angle emerges after TMC connection

Rabbi’s connection to Zakir Hossain, a former TMC Islampur block president, has added a political dimension to the arrest.

His family has strongly denied the allegations and argued that the action is politically motivated. Such claims are likely to become part of the wider political debate in West Bengal, where arrests involving members or associates of political parties frequently trigger competing allegations from rival sides.

For investigators, however, the central issue remains whether there is credible evidence connecting Rabbi to the suspected espionage network. His alleged political association does not by itself establish involvement in any offence, and the investigation will have to establish the evidence supporting the charges.

STF continues to trace the suspected network

With the arrest of Fazle Rabbi, the West Bengal STF is expected to intensify efforts to identify additional suspects and determine how the alleged network functioned.

Investigators are likely to examine the connections among the people arrested in Uttar Dinajpur, Cooch Behar, Burdwan, Kolkata and other parts of the state, while also assessing whether individuals outside West Bengal were involved.

The probe could also shed light on whether alleged espionage activities were connected to counterfeit currency, hawala transactions, forged identity documents or other forms of illegal activity.

For now, Rabbi remains an accused in an ongoing investigation, and the allegations against him will have to be tested through due legal process. The STF’s continuing investigation is expected to determine the extent of his alleged involvement and whether the recent arrests are part of a single coordinated espionage network or several interconnected cases.