In what could be one of the highest-level defections yet from the Syrian government, the country's military police chief has reportedly left Bashar al-Assad's forces to join "the people's revolution."

In a video posted online this week, a man identified as Maj. Gen. Abdul Aziz Jassim al-Shallal announced that he was joining the popular uprising.

"The Syrian military has strayed from its core mission in protecting the homeland to become nothing but armed gangs that kill and destroy the cities and the villages, carrying out massacres against our innocent civilian population that came out demanding freedom and dignity," he said.

Al-Shallal had been planning his escape to Turkey for weeks with the help of rebels, said Louai Miqdad, a spokesman for the rebel Free Syrian Army, speaking from Turkey.

"The last three hours of al-Shallal fleeing the borders were on a scooter," Miqdad said. "This is how hard things can get when it comes to the coordination of the defections of some of the Syrian officers and how the FSA works hard to guarantee their safety and the passageway of their families."

CNN cannot independently verify many claims from Syria, as the government has severely restricted access by international journalists.

If true, it would be only the latest in a rash of high-profile defections from al-Assad's government.

Manaf Tlass, a brigadier general and a former friend of al-Assad, left Syria's Republican Guard in July. Prime Minister Riyad Hijab has also defected as have a number of soldiers.

The defections, combined with recent gains by rebels on battlegrounds nationwide, suggest that al-Assad is losing his grip on a country that his family has commanded for more than 40 years. But the president has given no indication that he will step down.

Miqdad, the rebel spokesman, said it's in the best interest of Syrian officials to follow al-Shallal's lead.

"We would like to warn everyone who is serving in the Assad military: This is it. The time is near, and the FSA and the Syrian revolution are shifting the balance of power. If they don't defect now and denounce the regime, they will be considered to be traitors and they will have to face trial for the crimes that their troops committed against our people," he said.

"We urge them to defect now and join the revolution, or it will be too late."

Among the 3,300 Syrian refugees who have entered Turkey in the past two days, one was a member of Parliament, Turkey's state-run news agency TRT reported.

The Turkish Prime Ministry Disaster and Emergency Management Directorate said that 147,107 Syrians were staying in Turkey after fleeing Syria. It said a total of 206,954 Syrians had fled, but 59,847 returned home.

Fierce battle for key city and base intensifies

Months of intense fighting over the city of Maaret al-Numan and the Wadi al-Deif military base came to a head Wednesday, with rebels pushing for control of key government areas, dissidents said.

"If the rebels manage to take over the Wadi al-Deif base and Maaret al-Numan, it could be a severe blow to the regime in the north because it will give the rebels the upper hand in controlling the entire Aleppo-Damascus highway," said Rami Abdulrahman, director of the opposition Syrian Observatory for Human Rights.

He said such victories would be a major strategic gain because rebels would be able to cut off all the reinforcements to regime forces in Syria's largest city and commercial hub, Aleppo.

"Wadi al-Deif is considered to be the main fuel storage for the regime forces and the largest military base in Idlib province. If the rebels managed to cut off the road by taking over the base and the security checkpoints that surround it, the opposition fighters would cripple the regime forces' ability to mobilize their forces not only in Idlib, but in Aleppo as well," Abdulrahman said. "Hundreds of regime forces will be left in disarray to fight on their own without any reinforcement, fuel or food supplies."

By late Wednesday morning, rebels had announced "the start of the liberation" of Maaret al-Numan, the opposition Local Coordination Committees of Syria said.