Mystery has surrounded the discovery of six bodies at a luxury Bangkok hotel room on Tuesday (Jul 16), in what Thai media initially said was a shooting. 

Police now suspect that the six people found dead - all of Vietnamese descent - were poisoned.

Here is what we know so far:

WHAT HAPPENED?

The six foreign nationals checked into Bangkok's Grand Hyatt Erawan hotel at two separate times after arriving on Saturday and Sunday, according to the chief of Bangkok's Metropolitan Police, Thiti Saengsawang.

The group of three men and three women checked into different rooms - four on the seventh floor and one on the fifth floor.

Guests in the seventh-floor rooms were meant to check out on Monday afternoon but they did not. The check-out timing for the fifth-floor room was scheduled for Tuesday afternoon.

Cleaning staff discovered the six bodies on Tuesday afternoon - all in the fifth-floor room.

The police were called at about 5.30pm local time.

There was a seventh guest on the booking and authorities are looking for this person.