A key suspect in the Bangkok bombing has fled to Turkey, say police in Thailand.
Earlier on Monday, two men and a woman were detained in Malaysia in connection with last month's bomb blast which killed 20 and injured more than 120..
The Thai police chief has said that at least 10 people were involved in the Bangkok bombing and the attack was planned at least one month in advance.
"It is a big network. There was preparation using many people," Somyot Poompanmuang told reporters.
"This includes those who looked out on the streets, prepared the bomb and those at the site and...those who knew the escape route," he said.
"There must have been at least 10 people involved."
A Thai TV station apologises after dressing up a member of staff as the Bangkok bombing suspect and sending him to the scene of the blast.
Friends have paid tribute to a London law student who was killed in Monday's bomb blast in Bangkok.
Grieving family and friends of the victims of a devastating bomb attack in Bangkok have left flowers and messages at the site of the blast.