Sunni/Shi'ite Jihad Update from [1] AAP, with thanks to Twostellas:

Gunmen opened fire and threw hand grenades at a Sunni Arab mosque near the Iraqi town of Tikrit on Thursday, killing four worshippers and wounding up to 20 others, a police source and a local resident said.

A nephew of one of those killed, citing witnesses, said seven masked gunmen in traditional Arab clothes opened fire as people left the mosque in the small town of Alam after morning prayers, killing one person immediately.

He said the attackers hurled hand grenades as the worshippers fled back into the mosque, followed them inside and killed three others, including his uncle Dawod al-Khalid.