GAZA, Dec 31 (Reuters) - At least three Palestinians were killed and 30 others wounded as rival factions exchanged fire in the Gaza Strip on Monday, medical officials said.

One Fatah supporter, a teenager, and two Hamas members were shot dead at a demonstration commemorating Fatah's 43rd anniversary in the southern Gaza town of Khan Younis, the medical workers said.

Fatah officials said the teenager was shot by Hamas security forces. Hamas said it was Fatah gunfire that killed him.

Hamas said one of its supporters was shot dead as he exited a mosque and a security officer was killed after his jeep was attacked by Fatah gunmen.

Hamas seized the coastal territory after routing Fatah forces in June, and has since banned public gatherings by Fatah supporters.

Violence erupted on Monday when Fatah supporters defied the Hamas ban and demonstrated throughout the Gaza Strip. Witnesses said gunfire echoed throughout the streets of Gaza, and Hamas declared a full alert among its forces. (Reporting by Nidal al-Mughrabi; Writing by Ari Rabinovitch; Editing by Michael Winfrey)

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