Thailand's army chief has announced his armed forces are seizing power after months of deadly political turmoil.

Prayut Chan-O-Cha said on live TV: "In order for the country to return to normal quickly the National Peace Keeping Committee comprised of the army, the Thai armed forces, the Royal Air Force and the police need to seize power as of May 22 at 4.30 pm."

He said the commission that imposed martial law on Tuesday would now take full control of the country's administration.

The move follows two days of meetings between the country's rival political leaders that failed to break the deadlock.

Rival leaders at the talks, held at a heavily-guarded military HQ in the capital Bangkok, were seen being taken away by soldiers.

It was unclear whether they had been formally detained.

The impasse has seen nearly seven months of deadly protests in Bangkok.

"All Thais must remain calm and government officials must work as normal," General Prayut Chan-O-Cha added.

Irish people travelling to Thailand are being asked to register their details with the Department of Foreign Affairs first.

The Department of Foreign Affairs is asking Irish people there to "exercise extreme caution" and keep an eye on social media for updates.

It's also warning visitors to avoid any demonstrations or protests.