At least 20 people have been killed and dozens more wounded in a suicide bombing inside a church in Syria, according to the country's Ministry of Health and security officials.

State media says a suicide bomber in Syria has detonated himself inside a church filled with people, killing at least nine.

A shooting and suicide bombing at a Damascus church during a packed service on Sunday killed at least 22 people, authorities said, blaming a member of the Islamic State group for the unprecedented attack.