Several teams of detective were assembled today, a day after the daring attack on Finance Minister Ravi Karunanayake's campaign rally for the August 17 parliamentary elections, police spokesman Ruwan Gunasekera said.
The minister who escaped unhurt accused the opposition United People's Freedom Alliance (UPFA) of carrying out the attack, a charge denied by the party.
"We are investigating the motive for the attack," the police spokesman said adding that no arrests had been made 24 hours after the attack in a commercial area of the capital.
The 52-year-old finance minister is one of the most senior members of the UNP, which backed former president Mahinda Rajapaksa's successor Maithripala Sirisena in January's presidential election.
He had initiated several investigations into alleged fraud by members of the Rajapaksa regime.
But Rajapakse's UPFA denied any involvement, alleging an "internal clash" within the ruling party.
This year's campaign had been largely peaceful and local election monitors expressed surprise at yesterday's shooting.
Almost all previous elections have been marred by allegations that government workers colluded with the ruling party to give them an undue advantage.
The presidential election passed off relatively peacefully, although one Sirisena supporter was killed in a drive-by shooting.
