Seven labourers were killed on the spot and three others critically injured after a goods vehicle they were travelling in fell into a stream early Sunday morning in a village here, police said. According to police, these labourers hailing from Akkatangiyara Hala village in Gokak taluk were going to Belagavi when the vehicle fell into the ‘Ballari Nala' at Kanabaragi village in Belagavi.