Six people found dead in Bangkok hotel

A number of people were found dead at a hotel in Bangkok, Thailand (Napat Kongsawad/AP)

The bodies of six people have been found at a luxury hotel in Bangkok and poisoning is a possibility, according to police in Thailand.

Investigators said the bodies were foaming at the mouth.

Bangkok police chief Lt Gen Thiti Sangsawang identified the dead as two Vietnamese Americans and four Vietnamese nationals, and said there were three males and three females.

The victims had booked several rooms at the Grand Hyatt Erawan Hotel under seven names, and some were staying on a different floor from the room where they were found dead, he said.

Thai Prime Minister Srettha Thavisin speaks to the media outside the hotel in Bangkok (Napat Kongsawad/AP)

Police are still looking for the seventh person included in the booking, he said at a news conference at the hotel.

He said there were no signs of a struggle.

The residents of the room where the bodies were found were supposed to have checked out earlier on Tuesday and their luggage had already been packed, he said.

The bodies were discovered by a maid who went to the room after they failed to check out and found it locked from the inside, the police chief added.

There was food that had been ordered earlier from room service that was left uneaten, but drinks had been consumed, he said. He would not confirm a cause of death.

Police were summoned by hotel staff in late afternoon.

Prime Minister Srettha Thavisin went to the scene in the evening but did not provide any additional information to journalists.