At least 19 worshippers were injured during an explosion in the Sacred Heart of Jesus Cathedral in the Indonesian city of Makassar on Palm Sunday, the first day of the Holy Week in the Christian faith, the New York Times reports.

Why it matters: Indonesian President Joko Widodo called the bombing a terrorist attack, though authorities are still investigating the blast.

• Similar attacks targeting Christian places of worship in recent years have been traced back to local affiliates of the Islamic State in Indonesia, the Times notes.