Washington: The United States has warned Pakistan to take sustained, verifiable and irreversible action against the perpetrators of terrorism.

A senior administration official told reporters at the White House on Wednesday said, "We need to see Pakistan taking concrete and sustained action to reign in the terrorist groups, mainly the Jaish-e-Mohammad and the Lashkar-e-Taiba in order to ensure that we don't have re-escalation (of tension) in the region,".

 while warning the country that another terror attack on India will prove to be "extremely problematic", the official said, "And, if there's any additional terrorist attack without Pakistan having made a sustained, sincere effort against these groups, it would be extremely problematic for Pakistan and it would cause re-escalation of tensions, which is dangerous for both countries.

Asked about the steps being taken by Pakistan in the aftermath of the Balakot air strike by Indian fighter jets, the official said the US and the international community needed to see "irreversible and sustained" action against the terror groups. The official said Pakistan has taken some "initial" actions. They have frozen the assets of some terrorist groups and made some arrests. They have taken administrative control of some of the JeM facilities.

After the  Pulwama attack,Pakistan is facing pressure from many countries to act strongly against the  terrorist organistions.