BANGKOK, March 20 (Xinhua) -- Thailand plans to call on Laos to return a former Red Shirt leader so that he could be brought back to justice.

Defense Minister Prawit Wongsuwan said Monday he will shortly call on the Lao authorities to promptly locate and extradite Wuthipong "Ko Tee" Kochathamakul, said to be hiding out somewhere in the neighboring country.

Wuthipong, known as former hardcore leader of Red Shirt movement in Bangkok's northern outskirts, has been allegedly involved in illegal possession of war weapons and violating majesty charges.

He was said to have fled into Laos where he reportedly joined ranks with underground Thai political activists who have launched unrelenting attacks online against the current government under Prime Minister Prayut Chan-o-cha.

Prawit's comments came after a recent raid by army soldiers and policemen on a house in Lamlukka district of Pathum Thani province, about 45 km north of the Thai capital, owned by a man allegedly connected with Wuthipong.

The place was found out as a cache of varied war weapons including four M-16 assault rifles, an M-79 grenade launcher and about 5,000 rounds of ammunition, police said.