An IS commander and a child soldier were said to be among the 11 Islamic State group fighters killed by a US-led coalition in air strikes against Raqqa, Syria on Tuesday.
There has been conflicting report as regards the identity of the country which carried the bombing.
The Syrian Observatory for Human Rights was unable to specify neither the nationality of the aircraft that carried out the raids nor the identity of the slain commander.
The man was killed in a strike on the Ferdaos district, in Raqqa the jihadists' de facto capital in Syria. There were reports of raids elsewhere in and around the city which killed 10, including a child soldier from the ranks of the "Cubs of the Caliphate", said the Observatory.
The US-led coalition has expanded its operations in recent days, partly in response to the deadly attacks in Paris claimed by IS. Raqa is frequently the target of air strikes by the US-led coalition, as well as the Syrian air force and Russian warplanes that began an air campaign in Syria in late September.
When the terrorists claimed they were responsible for the Russia plane over Egypt’s Sinai Peninsula in October, Putin stepped up strikes against IS.
Britain-based Observatory reported of the death of at least 32 IS fighters in Sunday’s air strikes on Raqa province.
Raqa came under IS control since January 2014 after heavy fighting between the jihadists and opposition fighters, who had seized it from regime control in March 2013.