At least 61 people were killed after a packed bus struck a mine in northern Sri Lanka. Many of them were children.
Anxious locals thronged the hospital near the attack in Anuradhapura, an ethnic Sinhalese majority area
Some local people demonstrated, demanding better protection from the authorities.
Security was tightened in Colombo. The government blamed Tamil Tiger rebels for the attack, a claim the rebels denied.
Violence has been rising in Sri Lanka since late last year. Both sides blame each other for attacks.
Truce monitors say the country is sliding back to war. Last week, the rebels refused to meet Sri Lankan officials in Oslo.