"Three police officers were martyred and two others were injured in an explosion that occurred today near the police station in the city of Al-Mayadeen in the eastern countryside of Deir Ezzor," SANA reported.
"At exactly 07:13 pm (1603 GMT) today, an explosion occurred near the Al-Mayadeen police station," Khalil Abdulmoneim al-Ayoub, director of Al-Mayadeen city, said in the report.
"Initial investigations and an inspection of the site revealed that it was caused by a car bomb, resulting in the deaths of three members of the General Security and a number of injuries," he said.
The Syrian Observatory for Human Rights said five people had been killed in the blast, including four police officers, reports UNB.
"Two civilians, including a girl, were injured," it said.
According to the war monitor, the explosion coincided with the launch of a security campaign in Al-Mayadeen by the General Security, the country's new police force.