Update as of 7:45 a.m. EDT: Thai authorities said that a man arrested in connection with the Bangkok bombing possessed illegal explosives and a fake Turkish passport, according to the Associated Press.

"The passport you see is fake," Prawut Thawornsiri, national police spokesman, told the AP. "We don't know if he is Turkish or not."

Separately, BBC correspondent Jonathan Head tweeted that Thai police did not believe the arrested suspect was the main bomber.

Original story:

Police in Thailand Saturday arrested a man who they believe is the main suspect of last week’s Erawan Shrine blast in the capital Bangkok. They said the man matched the description of a suspect identified on surveillance footage.

On Saturday, Thai police raided the man’s apartment in northern Bangkok and arrested him in Nong Jok on the capital's outskirts, the Associated Press (AP) reported.

"It is most likely he is related to the bombing at Rajaprasong," said Chakthip Chaijinda, deputy police chief, according to the AP. "We found bomb materials in his apartment."

Prawut Thavornsiri, national police spokesman, reportedly said that the arrested man is a foreigner. However, he did not mention the nationality of the suspect.

"We found dozens of passports inside his room, we have to check which nationalities they belong to," Chakthip said on a televised broadcast, according to Agence France-Presse.

The Aug. 17 blast killed at least 21 people and wounded over 120. Soon after the bombing at the Hindu shrine, police released a grainy photo from a security camera footage that showed a man dressed in a yellow T-shirt carrying a backpack, identifying him as the main suspect.

Last Wednesday, Thai police released a sketch of the suspected bomber and issued an arrest warrant against him. They also said they were unsure whether the man was still in the country.

Police has also previously said that the attacker did not “act alone” and at least 10 people were involved.