quote from BBC news -

"A man is being held after an attempted terror attack at New York City's main bus terminal.

"Terrorists won't win," Mayor Bill de Blasio said after a blast at the Port Authority terminal in Manhattan during the morning rush hour on Monday.

The suspect, Akayed Ullah, a 27-year-old Bangladeshi immigrant, was injured by a "low-tech explosive device" strapped to his body, officials say.

Four other people suffered minor wounds when it blew up in an underpass.

A photo circulating on social media shows a man, said to be Akayed Ullah, lying on the ground with his clothes ripped and lacerations on his upper body.

Mayor De Blasio said he was believed to have acted alone."

http://www.bbc.co.uk/news/world-us-canada-42312293

Wasn't he trying to have it explode somewhere else, and it accidentally blew up in the tunnel?

heard it accidentally blew up