Hospital sources said the three foreigners were from one family in Norwich, eastern England
. They were not directly hit by the blast but were wounded when their van was hit by the bus and ran off the road, hospital sources said.
Their condition was listed as stable.
Two of the foreigners had minor injuries but they were badly shaken, a hospital official said.
The navy bus slammed into their van after being hit by a powerful landmine which the military and the police said was planted by Tamil Tiger guerrillas.
In a carbon-copy attack on Monday, five soldiers and two Sri Lankan civilians were killed in the northern peninsula of Jaffna.
The civilians were also in a vehicle that passed the area as the land mine went off.
-Amal Jayasinghe: win98win@gmail.com