The only fatality was the female suicide bomber.
The defence ministry initially said the bomber was a male.
The attack on the minister's vehicle convoy took place at Pirivena Junction, Boralesgamuwa, south of Colombo around 1.
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15 pm.
Six people traveling in the minister's convoy were wounded.
They included deputy minister of agrarian services Siripala Gamalath and agriculture ministry secretary Ranjith Wijethilake.
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Witnesses at the scene of the blast said a jeep that was part of the minister's escort travelling behind his vehicle was damaged.
Broken glass lay scattered around the site while a car had gone off the road.
Updated