At least 23 people were killed in DAESH and regime shellings in the eastern Syrian city of Deir Ezzor on Tuesday.
Nine school girls were among the dead as a mortar shell fired by the DAESH terrorist group hit their elementary school in the regime side of the city.
The oil rich city has mostly been controlled by DAESH since 2013, but half of the city still remains in regime hands.
The Syrian Observatory for Human Rights (SOHR) confirmed the attack on the school.
Another 12 died in the city as a result of regime raids, SOHR said.
“Warplanes carried out at least four raids on areas in the neighborhood of Al Hwiqa and Hamidiya in Deir Ezzor, which caused casualties and injuries, some of them are seriously injured,” the rights group said on its website.
"The toll is likely to worsen as some of the injured are in serious condition," SOHR head Rami Abdel Rahman told Agence France Presse.
The regime’s news agency SANA also said DAESH fired rocket shells which fell on a school in the Harabesh neighborhood in the city, claiming the lives of nine schoolgirls and injuring 15 others, citing a source from its interior ministry.
At least 24 more people died in air raids or fighting elsewhere in the country, including in the Latakia and Aleppo provinces, SOHR added.
At least 19 civilians including children were killed in regime air strikes on the Ghouta region outside the capital, Damascus.
Meanwhile, five people were killed and a dozen were wounded in air strikes on the town of Al Bab in Aleppo.
Over 20 air strikes, likely to have been carried out by Russia, also caused injuries in Latakia.
At least 250,000 people have died and millions of Syrians have fled their homes during the conflict since it broke out in March 2011.