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..
A man seen on CCTV carrying a backpack at the Erawan Shrine is the Bangkok bomber, police have said.
Police said he was "not just the suspect" and claimed he was definitely responsible for the attack that killed 22 people.
"The yellow shirt guy is not just the suspect. He is the bomber," Police Lt. Gen. Prawut Thavornsiri told The Associated Press.
Earlier, Thai Prime Minister Prayuth Chan-ocha suggested there could be more than one suspect.
In his first televised address since the blast, he told the nation that the Government will expedite "all investigative efforts to find the perpetrators and bring them to justice".
He also promised foreigners living in Thailand that the Government would do its best to safeguard their security, property and interests.
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.