A terrorist attack was carried out on a church in Indonesia on Palm Sunday.

Two suicide bombers targeted Sacred Heart of Jesus Catholic Cathedral in Makassar, the capital of Indonesia’s South Sulawesi Province shortly after Mass was over.

Both attackers were killed and around twenty congregation members were injured by the explosion. Security guards were providing protection to the cathedral and they prevented the bombers from entering the building.

A spokesperson for Aid to the Church in Need said many people would have certainly lost their lives if the bombers had of been able to detonate inside the cathedral building.

He added that it is part a disturbing trend in recent years of Christians being attacked during holy week.

The Indonesian national police chief said that the two bombers were connected with an Islamist terrorist group affiliated with ISIS and previously carried out terrorist attacks in the Philippines. They have also carried out attacks in Indonesia in the past, including other attacks on churches.

 The Indonesian President condemned the attack, stating “Terrorism is a crime against humanity.”