"We assume this to be an act of terrorism...The police had held a press conference in which it announced arrest of one Yusuf T who reported to have surrendered after a manhunt was launched," External Affairs Ministry Spokesperson Vikas Swarup said.
He said the police claimed to have got a confession that suggested that he has possible links with the IS.
"Investigation is on going and more details are awaited. We are closely monitoring the situation," he added.
Replying to a separate query, Swarup said government was committed to bring back Purulia arms drop case prime accused Kim Davy from Denmark.
A Dane, Davy is accused of orchestrating the air-drop of a huge cache of arms and ammunition, including 300 AK-47s, anti-tank grenades and rocket-propelled grenade launchers, from an AN-26 aircraft that he owned on the night of December 17, 1995 in West Bengal's Purulia district.