As the first bomb exploded on the tin-shed roof, the employees rushed to the main gate. Fifteen minutes later, another bomb exploded, injuring Faridul, Swapan Kumar and Shaheen.

They were rushed to a local clinic.

"I don't know why the Brac office was targeted by the terrorists," said Motlubur Hossain, manager of the office.

Locals said two motorcycle riders threw the bombs and just after explosion of the first bomb, they managed to escape at 9:00pm.

Local people suspect activists of Jamaat-ul-Mujaheedin, an extremist outfit active in Shaghata and surrounding areas might be involved in the incident.

Police recovered abandoned batteries used in the bomb blasts from the spot.

On December 18 last year a bomb blast on a drama stage adjacent to the Brac office injured ten people.

Twenty-one people were injured in bomb blasts on a Jatra (folk drama) stage at Takier Bazar in Palashbari upazila on December 25, 2004.