QUETTA - Authorities in Balochistan arrested a leader of a banned Iranian rebel group on Saturday as he was travelling on a bus from the lawless border area, security officials said.

It was not clear whether Pakistan would hand over Salam Rigi, a leader of the ethnic Baluch Sunni group Jaish al-Adl (Army of Justice), to Iran.

Rigi was seized by Pakistani authorities who were tipped off to his movements and intercepted the bus some 50 km from Quetta, one security official said on condition of anonymity.

A second security official confirmed the arrest, saying Rigi offered no resistance.

Rigi is accused of involvement in suicide bombings in Iran and Pakistan, as well as sending fighters to the conflicts in Iraq and Syria.

He is the cousin of the movement's late leader Abdolmalek Rigi, who was hanged by Iran in 2010, and had taken over many of his relative's leadership roles.

Jaish al-Adl operates in Iran's Sistan-Baluchistan province, which borders Pakistan.

The impoverished border area has been a hotbed of rebellion and is also rife with drugs and arms traffickers.