At least two people were grievously injured including a driver and a cleaner after a dumper overturned near Western express Highway on Friday. The accident occurred when a dumper loaded with sand and cement near Kala Nagar signal on Western Express Highway in Bandra area of Mumbai turned upside down. The accident took place when the driver lost balance and dumper's tire hit the road divider. Both have been sent to nearby hospital for treatment. The accident was followed by heavy traffic congestion in Western express Highway.