At least 24 people are reported to have been injured in a bomb explosion at a hospital in Bangkok.

The bombing took place on the third anniversary of a 2014 military coup in Thailand.

The Foreign and Commonwealth Office said in an updated travel advisory: “There was an explosion inside Phra Mongkut military training hospital, near the National Monument in Bangkok which caused a number of injuries; you should follow the advice of the local authorities.”

Kamthorn Aucharoen, commander of the police’s explosive ordnance team, was quoted by local media as saying: “It was a bomb. We found the pieces that were used to make the bomb.

“Right now, authorities are checking out closed circuit cameras.”

The deputy commissioner of the Royal Thai Police said investigators found traces of batteries and wires at the blast site and that the blast radius was up to 3 metres.