Facebook says it will hire another 3,000 people to review videos and posts of crime and other questionable content following murders shown live on its site.

That's on top of the 4,500 people Facebook already has for such reviews.

The announcement comes from CEO Mark Zuckerberg in a Facebook post Wednesday.

In addition to hiring more reviewers, Zuckerberg said Facebook will also be "building better tools to keep our community safe."

"We’re going to make it simpler to report problems to us, faster for our reviewers to determine which posts violate our standards and easier for them to contact law enforcement if someone needs help," he said. "No one should be in this situation in the first place, but if they are, then we should build a safe community that gets them the help they need."

Facebook has been criticized recently for not doing enough to prevent videos - such as a murder in Cleveland and a killing of a baby in Thailand - from spreading on its service.

Videos and posts that glorify violence are against Facebook's rules. But in most cases they're only reviewed and possibly removed if users report them.

News reports and posts that condemn violence are allowed. This makes for a tricky balancing act for the company.