(Adds detail of explosion)

BEIRUT, May 20 (Reuters) - A woman was killed when an explosive device detonated near a shopping mall in eastern Beirut late on Sunday, a security source said.

Witnesses said six people were wounded by glass when windows in the area of the blast shattered.

"There was an explosive device either under a car or next to a car," another security source said, adding it took place in the car park of a popular mall in a Christian district in east Beirut.

The first source said the woman was killed when a wall at her house collapsed on her.

A Reuters witness said a plume of smoke could be seen rising from the area.

Witnesses said the bomb appeared to have exploded under a car in a car park near the ABC department store, one of the biggest stores in Lebanon.

The blast came as Lebanese troops battled Islamist militants based in a Palestinian refugee camp in the north of the country on Sunday and 48 people were killed in Lebanon's bloodiest internal fighting since the 1975-90 civil war.

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