This comes to about 4,056 civilians killed. The numbers focus on large scale killings. It doesn’t take into account isolated killings. If we’re to include the entire scope of all types of civilian killings, we’re looking at somewhere close to 10,000 civilians killed.
The sources are largely from open sources, media mostly. Remember, these are rough estimates, they’re not final reports nor have they been investigated thoroughly yet. An investigation is needed to solidify the numbers.