In Rajasthan, six persons were killed and over half a dozen injured on Sunday night in a head-on collision between two jeeps in Udaipur district. IG-Udaipur range, T C Damor said, six passengers were killed in the mishap involving the two jeeps at Mandwa area.A police inspector present at the spot said, four persons were killed on the spot and two others succumbed to their injuries later in hospital.