"Why do Pakistan's army and security body ... give refuge to these anti-revolutionary groups? Pakistan will no doubt pay a high price," Jafari said in remarks live on state television.

Iran warned neighbouring Pakistan on Saturday it would "pay a heavy price" for allegedly harbouring terrorists who killed 27 of its elite Revolutionary Guards in a suicide bombing near the border earlier this week, state television reported.

Revolutionary Guards chief Major General Mohammad Ali Jafari also accused Tehran's regional rival Saudi Arabia and the United Arab Emirates of supporting terrorist groups that attack Iranian forces, saying they could face "reprisal operations."

Pakistan, Saudi Arabia and the UAE deny backing such terrorists.