Sri Lankan government forces have shelled a hospital inside the conflict zone killing at least 45 people, Tamil Tiger rebel and hospital sources say.
The rebels said the makeshift hospital in Mullivaikal was hit early in the morning, and people injured in weekend attacks were among the dead.
A government spokesman denied knowledge of the incident, but said the army was not using heavy weapons in the zone. The claims are impossible to verify as reporters are banned from the area.
More than 400 people were killed and over 1,000 injured over the weekend in what the UN has described as a bloodbath.
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