Activists said Syrian troops and rebels clashed in a Palestinian refugee camp in the capital, Damascus, Tuesday.
They also said fighter jets have resumed attacks on the northern province of Idlib and suburbs of the capital.
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Tuesday's airstrikes come a day after activists reported the most widespread bombing in a single day since Syria's 19-month crisis began.
The Britain-based Syrian Observatory for Human Rights and the Local Coordination Committees said fighting in the Yarmouk refugee camp broke out after midnight. They had no word on casualties.
But many Palestinian youths have joined the fight as they became enraged by mounting violence and moved by Arab Spring calls for greater freedoms.
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