Story highlights The Pakistani government says its security agencies are investigating

A group believed to be based in Pakistan's Balochistan province claims responsibility

(CNN) Eight Iranian border guards have been killed in clashes with militants near the border with Pakistan, Iranian state media reported.

Three of the militants were killed by Iranian forces in the fighting Monday in the southeastern town of Negur, the state-run news agency IRNA reported.

The news agency cited Ali Asghar Mirshekari, the deputy governor of Iran's Sistan-Baluchestan province, who said the militants crossed into the country from Pakistan. Iranian officials have reportedly asked Pakistani authorities to catch the surviving assailants.

A militant group called Jaish al Adal claimed responsibility for the attack, according to Iranian state media and a Twitter account believed to be associated with the organization.

According to Pakistani media, Jaish al Adal is an anti-Iranian group that has emerged during recent years in areas of Balochistan, the restive Pakistani province that borders southeastern Iran.

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