DAMASCUS: Syrian leader Ahmed Al-Sharaa vowed Monday that those involved in a “heinous” suicide attack on a Damascus church would face justice, as he called for unity in the diverse, multi-faith country.

The shooting and suicide bombing Sunday at the church in the working-class Dwelaa district of the Syrian capital killed 25 people and wounded 63, the health ministry said.

The authorities who took power after ousting longtime ruler Bashar Assad in December said the attacker was affiliated with the Daesh group, which has not yet claimed the attack.

“We promise... that we will work night and day, mobilizing all our specialized security agencies, to capture all those who participated in and planned this heinous crime and bring them to justice,” interim President Sharaa said in a statement.

The attack follows incidents of sectarian violence in recent months, with security one of the greatest challenges for the new authorities.