Gunmen kill Nusra Front's security official in Daraa

 A senior commander in the al-Qaeda-linked group Nusra Front was killed on Monday in southern city of Daraa by unidentified gunmen, activists said.

Ahmed Mohamed al-Falouji, Nusra's security official in Daraa, was assassinated by unknown group broke into a field hospital where he was receiving a treatment and shot him dead.

Three days ago, another Nusra Front's senior commander in Maaret al-Nouman was escaped another explosive.

Also in Daraa, Saber Safar, the commander of First Army, FSA unit, was escaped an assassination attempt on Saturday.

Activists and rebels groups have accused Islamic State and Syrian regime by doing such serial killing.

The key rebel group Ahrar al-Sham movement has also been under fire amid a mounting number of senior fighters killed by unidentified groups.

Last Saturday, Abu Rateb al-Mazzawi, Ahrar al-Sham's senior commander in Eastern Ghouta suburbs, was killed in an explosive device planted in his car, while Abu Mousa al-Kanakri had escaped an assassination attempt near Damascus, according to activists.

Ahrar commander in Hama countryside was also escaped death before an explosive device exploded in his car.