CNN reported:

The southern Philippines city of Jolo is on lockdown after a deadly double bombing Sunday, as the authorities try to ensure security and investigate the attack that killed at least 20.

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The bombing — which was claimed by ISIS — has raised fears of an increase in separatist violence in the country’s restive Mindanao region, following a referendum last week in which an overwhelming majority of voters backed self-rule.

Bombs exploded at the Jolo Catholic Cathedral during Sunday mass, officials said, killing 20 and injuring at least 81 people, including 14 soldiers and two police officers.