(CNN) -- Fresh explosions and riveting gunfire punctuated the pre-dawn hours Monday in cities around Syria, opposition activists said, with the ongoing violence coming on the heels of yet another bloody weekend in the embattled nation. Around 3 a.m., the Local Coordination Committees of Syria -- a network of opposition activists -- reported on its Facebook page that at least three major blasts in a few hours had rattled the Damascus neighborhood Mazzeh, where persistent gunfire rang out for at least an hour. The same group also reported other pockets of violence early Monday around the capital, including "intense shooting" in Dummar and Keswa "from the security checkpoints all over the city."
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NEW: At least 3 explosions rock Damascus early Monday, an opposition network says
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NEW: Additional fighting is reported in other cities around Syria as well
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At least 67 people were killed around Syria on Sunday, one group says
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Syria's government blames terrorists for weekend blasts that killed 27
The blast occurred a day after 27 people died after two "booby-trapped" cars exploded in crowded areas of @placeholder, said SANA.