At least four people were killed and at least 50 injured after a bomb exploded during a morning Catholic Mass in a university gymnasium in Marawi, a city in the south of the country besieged by Islamist militants for five months in 2017.

MANILA, Dec 3 (Reuters) - Islamic State militants claimed responsibility for a deadly bombing at a Catholic Mass in the Philippines on Sunday that killed at least four people and injured 50 others.

The attack was carried out in a university gymnasium in Marawi, a city in the south of the country besieged by Islamist militants for five months in 2017.