Thai police said on Monday that one of the two arrested men who were allegedly involved in last month's deadly bomb attack had confessed to possessing banned explosives.
The deadly bomb attack hit a main tourist attraction in Bangkok, the Erawan Shrine, on Aug. 17, leaving more than 22 people dead and numerous victims wounded.
The suspect, Yusufu Mieraili was arrested last week near the Thai border as he was trying to cross into Cambodia.
National police spokesman Prawut Thavornsiri told reporters at a news conference after police caught the suspect that he was carrying a piece of paper with a formula on how to make a bomb.
"We have informed him [Yusufu] of the charge of jointly possessing and owning explosives that are banned by the government. He acknowledged the charge and confessed [to it],” Prawut said.
Mieraili's nationality has not been been revealed yet, although he was carrying a Chinese passport on him with the birthplace listed as the autonomous Uighur region, Xinjiang, when he was arrested.
Adem Karadag, another suspect who was arrested while carying a Turkish passport following a raid on his flat in a Bangkok suburb was detained for possessing bomb-making paraphernalia and dozens of fake Turkish passports.
Following the suspects' detention, forensic investigations were conducted into the two suspects, however they failed to directly link the suspects with the Erawan Shrine blast, the police said on Friday.
The DNA test results of two arrested suspects linked them to explosives found in an apartment raid, but they did not match DNA evidence taken from the blast area.
Meanwhile, Thai police are tracking a husband and wife who they suspect of being connected to the deadly blast at the shrine. It is believed that the couple left the country following the attack.
Thai police gave the names of the new suspects as Emrah Davutoglu and Wanna Suansan last week. Wanna is believed to be Thai, while police have previously said Davutoglu is Turkish.
Davutoglu is blamed for organising and providing accommodation to other suspects while his wife allegedly also connected with the attack.
Wanna’s mother told the police last Monday that her daughter left Thailand two months ago "to stay with her husband in Turkey."
Wanna also denied any involvement in the attack when she contacted Thai police through social media. She also admitted renting a room in an apartment in Bangkok, though she said she moved from there almost a year ago during her online meeting with the police.