A top counterterrorism official in Bangladesh said Wednesday the man accused of detonating a pipe bomb in a New York City subway tunnel does not appear to have any known links to militant groups.

Monirul Islam said investigators have interviewed the Akayed Ullah's wife and her parents as part of their probe.

The 27-year-old Ullah is due to make his first court appearance Wednesday, a day after U.S. federal prosecutors announced terrorism charges against him. The charges against him include bombing a public place and using a weapon of mass destruction, each of which carries a maximum sentence of life in prison.

Ullah was also accused of providing material support to Islamic State, destruction of property by means of an explosive and using a destructive device in furtherance of a crime of violence, according to a criminal complaint disclosed on Tuesday. These charges carry sentences of five to 30 years each.

Joon Kim, acting U.S. Attorney for the Southern District of New York, announced the charges at a press conference in New York.

The attack took place in a tunnel that connects the Port Authority Bus Terminal and the Times Square subway stations. Surveillance footage shows the attacker walking among the rush-hour crowd, and then smoke filling the area as the device goes off. The man is then seen laying on the ground as people rush away from the scene.

孟加拉国一位高级反恐官员星期三说，被指控在纽约地铁隧道引爆一枚管状炸弹的男子看来没有与激进组织有任何关联的前科。

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