The Islamic State (ISIS) has claimed credit for a deadly Monday attack at a mosque in Oman — the group’s first in the Gulf state, despite its persistent targeting of Shiite Muslims.

Six people were killed in a shooting attack near a Shiite mosque in the capital, Muscat, including four Pakistani citizens and one Omani police officer. The three gunmen were also killed, and another 28 people of various nationalities were wounded, Agence France-Presse reported.

ISIS claimed credit for the attack on Tuesday on the messaging service Telegram.