An explosion and fire on a bus in Diyatalawa this morning left 19 injured, including Sri Lankan army personnel.
The army commander informed the prime minister, Ranil Wickremesinghe the incident was caused by a hand grenade.
"The Army denies any terrorist involvement in the incident. Police investigations are in progress," the army's website stated.
The bus was a private vehicle travelling from Jaffna to Diyatalawa.
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