According to the SANA news agency, two children and two women were killed when extremists shelled Aleppo’s district of Midan, amid ceasefire in force in Aleppo.
Sources in the Idlib province claimed that one person was killed and at least two people were injured after militants shelled of the town of Fuah.
Syria has been mired in civil war since 2011, with government forces loyal to Syrian President Bashar Assad fighting numerous opposition factions and extremist groups. A ceasefire brokered by the United States and Russia came into force across the country on February 27, however it excludes terrorist groups such as al-Nusra Front and the Islamic State, both of which are outlawed in Russia.
On Wednesday, Moscow and Washington agreed that the ceasefire in Syria should include the city of Aleppo. The "regime of calm" came into force on Thursday.