The US has sent a tough message to Pakistan for the third time to act fast against perpetrators of Pathankot terror attack. Talking to media in Washington, a senior US state department official asked Islamabad to walk the talk on its promises to act tough against terrorists operating from its soil.

He also asked Pakistan to conduct a complete and thorough probe into the terrorist attack on the Pathankot air base.

He said, the US was in touch with Pakistan on this issue. He said, the Pakistan had said they are going to investigate.

It should be aggressive in its counter terror operations and bring the perpetrators of the Mumbai terror attack also to justice, he said.

According to officials in Washington, it would become very difficult for the US Government to convince the Republican-controlled Congress to approve the sale of eight F-16s to Pakistan, if Islamabad is seen as reluctant in taking action against terrorist groups.