Scores killed in Nugegoda blast
At least 17 people were killed after a huge bomb blast in Nugegoda Bo Tree junction, defence authorities said.
Defence affairs spokesman, Minister Keheliya Rambukwella, told BBC Sandeshaya that the government suspect Tamil Tigers.
Military spokesman, Brigadier Udaya Nanayakkara told BBC Sinhala.com that 20 people were admitted to the hospital.
A fire fighter who did not want to identify himself told BBC's Elmo Fernando that a parcel left in front of No Limit retail shop in Nugegoda exploded as they tried to open it.
Ministry of education has ordered all private and government schools to be closed on Thursday and Friday as a security measure.
Recent rebel attacks on civilian targets of this scale have been rare, but bombings causing mass casualties in the south have been a feature of Sri Lanka's conflict in the past.
The second explosion in the capital, Colombo, happened hours after a suicide bomber struck the centre of the city.
The suicide bomber has targetted Social Affairs minister Douglas Devananda, authorities said.