BANGKOK, Sept. 19 (Xinhua) — The death toll of a ship accident in Ayutthaya, Thailand has risen to 18, as three more bodies were found on Monday morning, local media reported.

The ship carrying over 100 Thai Muslims capsized on the Chao Phraya River in Ayutthaya on Sunday afternoon.

Authorities are looking for those who were missing in the accident.

The known victims included six women, six men, and a boy, and details of the other victims were not known, Prayoon Rattanasenee, governor of Ayutthaya Province said early Monday, according to Bangkok Post.

Passengers of the ship, mainly Thai Muslims from Nonthaburi province, were on their way back after attending a ceremony in Ayutthaya when their double-decker boat hit a concrete flood barrier before sinking.

Deputy Ayutthaya governor Rewat Prasong said earlier it was believed more than 150 passengers were on board when the accident occurred.

Ayutthaya, a UNESCO World Heritage Site, is located some 80 km north of the Thai capital Bangkok.