Iran’s deputy police chief accused Pakistan on Saturday of providing a haven for members of an armed rebel group that has claimed responsibility for the deadly twin suicide bombings last week in front of a mosque in the southeastern city of Zahedan.

Chief Ahmadreza Radan also said the authorities had detained 40 people who were seeking to create a disturbance in the city after the bombings, the semiofficial ILNA news agency reported.

The arrests appeared to be part of a crackdown in the Sunni-dominated province of Sistan-Baluchistan, where the rebel group, Jundallah, has been operating. Iran is predominantly Shiite.

Without naming Pakistan specifically, he issued a tough warning to “neighbors on the eastern borders” of Iran.