The group said it learned of the killings from local sources in the city, which has been under ISIS control since May. The London-based Syrian Observatory for Human Rights relies on activists inside Syria to document human rights violations in the country .
Not much else is known about the executions, including the names of the men or what they were accused of.
But ISIS has killed for the slightest of offenses and used brutal ways to do so.
In another recent execution, ISIS ran over a member of the Syrian military with a tank "because he ran over dead bodies of the Islamic State soldiers by tank."
Some sentenced to death have been forced to dig their graves with their own hands before being put to death.
