Two foreign container vessels collided head-on in the Hooghly river in South 24 Parganas district of West Bengal today, leaving both the ships damaged. District police superintendent L N Meena said, the collision between the ships, 'Green valley' and 'Tiger Singh' occurred at about 11:30 AM at the confluence of the Hooghly and Rupnarayan rivers near Nurpur. He said,there is neither any casualty nor any oil leak due to the collision.