Thai police say an arrest warrant has been issued for a man suspected of gunning down a former opposition politician from Cambodia in a popular Bangkok tourist area. Lim Kimya, an ex-lawmaker from the dissolved Cambodia National Rescue Party, was shot dead near a temple close to Khaosan Road on Tuesday evening. He had reportedly just arrived at the scene with his wife by bus from Cambodia. Siam Boonsom, chief of Bangkok police, told reporters on Wednesday the initial investigation led them to believe the gunman was hired to carry out the shooting. He declined to give further details, citing an ongoing investigation. Lim's party and human rights groups called for an immediate and transparent investigation.