Two television cameramen were among four people killed in a helicopter crash in China's Chongqing city on Sunday, a media report said.The crash occurred around 1 p.m. when the Bell 407 GX aircraft lost contact with ground control, after departing from Wanzhou district to Liangping county, Xinhua reported.Jiang Ya and Song Hao'en -- both cameramen of the Chongqing Broadcasting Group who died in the crash -- were filming for television programme "A Bird's Eye View of the New Chongqing" that began in 2012 and aims to present the development of Chongqing through aerial videos.Rescuers found the debris of the helicopter and bodies of all four victims around 6.30 p.m. in Hucao village of Liangping. The cause of the crash was under investigation.