WASHINGTON, March 4: The United States has vowed to work with Pakistan for catching those responsible for the suicide bomb attack in Karachi that killed an American diplomat and three Pakistanis.

“We will do all that we can, working with the Pakistani government, to see that those responsible for this attack face justice for what they have done,” US State Department’s deputy spokesman Adam Ereli told a briefing here on Friday.

“There is no cause that justifies terror and we stand with the people of Pakistan in our common fight against terror,” Mr Ereli said.

He said the attack was under investigation and the investigators were trying to determine if the terrorists knew who their target was or it was a random attack.