Seven persons, including four contract labourers from Jharkhand, were killed and four others seriously injured when their vehicle collided with a speeding lorry at Visakhapatnam in Andhra Pradesh this morning. Police said, the mishap occurred at around 5.45 am. Four of the deceased hail from Jharkhand and were working as temporary labourers in Gangavaram Port while the remaining were from nearby areas of Visakhapatnam. The lorry driver has been taken into custody and further investigations were on. <br/>