A bomb blast has killed six people and injured 32 in the Salah al-Din district of Aleppo, Syrian state television reports.
Salah al-Din is located west of Aleppo's Old City in a district that was part of the last rebel enclave there until it was taken over by the Syrian army in an advance in December.
There was no immediate claim of responsibility for Wednesday's blast.
Meanwhile the Syrian Observatory for Human Rights said 45 buses containing some 3000 people left the villages of Foua and Kefraya in the north-western province of Idlib heading for government-controlled Aleppo. The evacuees included about 700 armed militants.
The evacuation comes days after more than 100 people - mostly civilians - were killed in a car bombing hitting evacuees outside the northern city of Aleppo.
Several hours later, the evacuees from Foua and Kefraya arrived in the area of al-Rashedeen outside Aleppo, a Syrian security source said, adding that they would be transported into the the city later in the day.
Simultaneously, 11 buses carrying more than 300 evacuees from government-encircled towns near Damascus were on their way to Idlib, which is mostly controlled by the rebels, according to the monitoring group.
Those evacuees included rebel insurgents, who set fire to their premises in al-Zabadani on the outskirts of Damascus before their departure, Syria's state news agency SANA reported.