"At the checkpoints at the entrance to Aleppo, the three-level checks of all those willing to enter the town are currently carried out," officer Al-Afar Muhamedi told journalists, adding that people usually spent from five to 30 minutes at the checkpoints.
In the first checkpoint zone, the checks are carried out by cynologists. A dog, presented to the Syrian military personnel by the Russian side, is among the dogs taking part in the checks.
The security checks procedures are standard for all the dozen checkpoints around Aleppo and the Syrians regard tightening the security measures with understanding, dog specialist Muhammad Farka said.
Since 2011, Syria has been suffering from the civil war between the government troops and various opposition and militants groups. Since 2012, Aleppo has been under control of the opposition forces. As a result of an offensive, the government troops regained control over the city in December 2016.