A foreign national, believed to be a Southeast Asian, was among those wounded Wednesday, police said adding that his vehicle was hit by a Claymore mine in the northern district of Vavuniya.
The man and his local driver were taken to the main hospital in the area 265 kilometres (160 miles) north of Colombo, police said.
They said two sailors were also wounded when their water-tanker was ambushed with a Claymore mine in the adjoining district of Mannar.
The blasts came as police found the bodies of five men killed overnight near a military camp in Puttur in the Jaffna peninsula where a mine attack wounded two soldiers on Monday, police said.
There was no immediate claim of responsibility for the killings, but the pro-Tamil rebel Tamilnet website said it was the work of government forces.
Tamilnet said the men had been taken to an army camp in the area on Tuesday night and later shot dead.
"The five civilians were... ordered to run through the Tharavai area, an open terrain near the