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..
Thai investigators do not know if the man suspected of bombing a Bangkok shrine is still in the country, police said on Wednesday.
The nationality of the suspect, who police believe was part of a "network", also remains a mystery.
Police chief Somyot Pumpanmuang told reporters: "He didn't do it alone, for sure. It's a network."
He added: "I don't suspect one person, I suspect many people.
"I am confident that there are Thais involved but I am not saying it is just Thais or that there are foreigners."
Chief Pumpanmuang said it was not clear if a small second explosion on Tuesday was linked to the Erawan shrine attack.
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.