BEIRUT (AP) - An American woman is among two journalists who've been killed today in Syrian shelling of an opposition stronghold in the city of Homs.

Marie Colvin, who was working for Britain's Sunday Times, died along with a French photojournalist. Activists say today's shelling claimed at least 13 lives.

France's president says, "That's enough now, the regime must go."

Colvin, from Oyster Bay, New York, was a war reporter who had covered conflicts from Sri Lanka to Syria. She had been a foreign correspondent for The Sunday Times in Britain for the past two decades.