Foreign Office spokesman Nafees Zakaria said that allegations in the media on Pakistan's involvement with Haqqani network are "preposterous".
"In fact, we were shocked and deeply saddened when precious American lives were lost at the Chapman facility in 2009 in an unfortunate attack that was later claimed by TTP in a publicly available video, featuring the suicide bomber with the leader of the TTP," Zakaria said in a statement.
"We wish to remind that Pakistan is among the biggest victims of terrorism, having lost tens of thousands of innocent lives, including over five thousand valiant personnel of law enforcement agencies, and economic losses to the tune of a hundred billion dollars," he said.
Pakistan is determined to eradicate the scourge of terrorism and has taken action against all terrorist elements, without discrimination, he added.