Muslim and Christian religious leaders appealed for calm Tuesday after grenades exploded almost simultaneously at two mosques in the southern Philippines. Five people were wounded.

The religious violence began Sunday with a fatal grenade attack at the city's Roman Catholic cathedral. Seven people died in that attack, and about 140 were injured.On Monday, two rifle grenades were fired at a mosque in Davao City, followed by two similar attacks today on two other mosques in the same city.

Police said a rifle grenade fired at a mosque near the city market injured five bystanders. Moments later, another grenade was fired at a second mosque a few miles away but caused no injuries.

Authorities were unsure whether the mosque attacks were reprisals by militant Christians or carried out by the cathedral attackers to foment religious conflict.

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No group has claimed responsibility, and there have been no arrests.

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