Egyptian security officials say clashes between Muslims and Christians in the Mediterranean port city of Alexandria left one man dead of a heart attack.

Officials say the clashes in the city's el-Dekheila suburb erupted when a Coptic man allegedly sexually harassed a Muslim woman.

Residents of the area fired birdshot and threw Molotov cocktails at one another during the Friday night fighting.

Police say Christian resident Sherif Sedky died of a heart attack during the clashes. Police forces were beefed up around the local church Saturday in case of further violence.

Officials spoke on condition of anonymity because they were not authorized to brief the media.

Coptic Christians make up about 10 percent of Egypt's population. Sectarian violence has been on the rise in Egypt over the past two years.