Cambodian police say they have apprehended a Thai man suspected of gunning down a former opposition politician from Cambodia in a popular Bangkok tourist area.

Thai authorities should immediately and thoroughly investigate the killing of a former Cambodian opposition politician in Bangkok.

A suspected hit man who shot dead a former Cambodian opposition lawmaker in a brazen attack in Thailand's capital Bangkok was arrested in Cambodia after a day-long manhunt, a senior Thai police official said on Wednesday.

Lim Kimya, a French-Khmer citizen and former member of parliament for the outlawed Cambodian National Rescue Party (CNRP), was allegedly shot dead by a former Thai naval marine, named Ekkalak Pheanoi, 41, who was identified with CCTV footage.

Responding to the fatal shooting of Cambodian-French former opposition MP Lim Kimya in Bangkok, Thailand, Amnesty International’s Interim Regional Deputy

Lim Kimya had arrived in Thai capital Bangkok along with his wife, uncle from Siem Reap, Cambodia's 2nd-largest city - Anadolu Ajansı

Amnesty International denounced the killing of a former Cambodian-French opposition politician in Bangkok, Thailand on Wednesday. Lim Kimya, a former member of the Cambodia National Rescue Party

He had just arrived in Bangkok with his wife on a bus from Cambodia. A police officer attempted to resuscitate him, but he was pronounced dead at the scene. "He was courageous, with an independent mind,

Lim Kimya was shot dead on Tuesday by a gunman on a motorbike as he arrived in the Thai capital from the Cambodian city of Siem Reap by bus.