Pakistani officials say security forces have killed at least 39 suspected militants in countrywide operations following a suicide attack at a famed Sufi shrine in the country's south.

The attack was claimed by the Islamic State group which said it targeted a Shiite gathering.

Three security officials say the overnight raids also led to the arrest of 47 suspects, including some in Sindh province where the attack on the shrine happened the previous day.

They say the raids targeted militant hideouts and led to shootouts with insurgents. Across Pakistan, at least 39 suspected militants were killed.

The officials spoke on condition of anonymity on Friday because they were not authorized to talk to reporters about the security operations.