Stringent security measures have been in place in risk areas of Bangkok, particularly at the embassy of Israel, Khao San road and Sukhumvit Soi 22 in Bangkok, police chief Priewpan Damapong said on Saturday.
Pol Gen Priewpan said he had ordered the crime suppression division, metropolitan police and tourist police to ensure peace and order in these risk points.
He said people should not panic because police are capable of keeping the situation under control.
Tight security in the capital came after the United States and Israel had yesterday issued a warning of possible severe terrorist attacks in Bangkok.
Police detained a Lebanese suspect suspected links to the Hezbollah militant group at Suvarnabhumi airport last night.
Deputy Prime Minister for security affairs Chalerm Yubamrung said police have control of the situation and urged the public not to panic.
The situation was not as severe as initially feared, he added.