Islam was among nine persons arrested by Morigaon police on May 24 in a crackdown on illegal immigrants declared by the Foreigners' Tribunal, but who had been evading deportation.
Eight persons have been killed in floods and landslides in Assam as incessant rainfall caused massive inundation in 17 districts, affecting over 78,000 people, officials said on Saturday.
Seven rivers, including the Brahmaputra, were flowing above the danger level, even as the Regional Meteorological Centre (RMC) in Guwahati predicted heavy to very heavy rainfall at isolated places in the state.
The rain and flood situation in northeastern states remained grim on Tuesday, with lakhs people affected in Assam, Mizoram and Manipur, even as the meteorological department predicted more rain in several parts of the region.
The visit of a high-level delegation of revenue officials from Bangladesh to India-Bangladesh border areas in Dhubri sector in western Assam has triggered sharp protests by political and non-political groups in Assam.
In a record turnout, more than 90 per cent voters exercised their franchise in 14 constituencies in Assam in the second and final phase of just concluded assembly polls.