Bangkok: A bomb exploded in the reception room of a military-owned hospital in the Thai capital on Monday, the third anniversary of a 2014 coup.

Twenty-five people were wounded in the blast at the Phramongkutklao Hospital near Bangkok's historic Victory Monument, which is popular with retired military officers.

"It's confirmed to be a bomb," said Bangkok police commissioner Srivara Ransibrahmanakul.

Traces of a battery and wires were found among the debris.