At least two soldiers and five civilians have also been killed in the fighting, the source told AFP.
An earlier toll released yesterday put the figure at 70 dead in the unprecedented police and army operation, with the military saying all were suspected members of the rebel Kurdistan Workers' Party (PKK).
Some 10,000 troops backed by tanks have been deployed in the southeast to try to rout young PKK supporters from urban areas, according to local media.
On Friday, the military also carried out air strikes on alleged PKK hideouts and weapons sites across the border in northern Iraq, where the outlawed group has its rear bases.
Images published by the Anatolia news agency show heavily armed soldiers backed by tanks going house-to-house in the towns and firing from street corners.
Army forces chief General Hulusi Akar visited Sirnak province yesterday for a briefing by the local military command.
But Kurdish activists and politicians have accused the army of acting with impunity and pounding large parts of the towns to rubble.
The army said that two schools that had been used by the PKK as hideouts had been rendered inoperable while a stash of arms had been seized in Silopi.
The education ministry recalled teachers from the area and schools were closed, as were health services due to a lack of doctors who have fled the conflict zone.
Although analysts have called for peace talks, the authorities led by President Recep Tayyip Erdogan, buoyed by his party's victory in the November 1 election, have said Ankara must eradicate the PKK.
Prime Minister Ahmet Davutoglu condemned what he said was "an attempt to unleash a civil war".
