The man was arrested Saturday and is denying any involvement, according to police spokesman Lt. Gen. Prawut Thavornsiri.
"He has been relatively cooperative," Prawut said. "He gave us some information."
Police found fuses when they searched the man's apartment in a suburb of Bangkok, according to Prawut.
However, he is not the man in a yellow T-shirt and dark-framed glasses who was identified from surveillance video as the chief suspect in the bombing, Prawut said.
"The man we have is not the man in the sketch, but we believe he is part of the network which carried out the two bomb incidents," he said.
Prawut initially said the suspect arrested Saturday was a Turkish national. But he subsequently told CNN: "At first we thought he is Turkish. But we just found out two Turkish passports he is holding are all fake.
"We also found many empty fake passports, also various kinds of evidence."
Prawut said investigators hunting for clues had "also found the same type of ball bearings in this man's apartment."
High-ranking police officers, forensic experts and army personnel were all seen outside the building shortly after news of the arrest broke.
The apartment is in the Nong Jok suburb, an area known to house a large Muslim community.
Source - CNN
