Here's a video of Hamas shooting out of a schoolyard. I'll rephrase what I've said earlier as it's misleading... They fire from and move into populated areas hoping to hide from Israel. So.. they don't use children as shields in a literal sense... but they shoot out of places that they think Israel wont shoot into. As you can see in this video... the IDF waited for them to leave the school yard before attacking them

[link to www.youtube.com]