Man next door is beating his girlfriend

I've been here since the 12th of this month and I'm just hearing this. I'm nervous to get involved as I'm a single woman with small toddler kids.

But just hearing that for one night was heart breaking.

I was thinking of telling my leasing agent Monday.

Maybe through email because I don't want any trouble.

Also hoping this won't put her in any danger.

Anyone experience this? EDIT(thanks guys. Also what if i call but it stops??when they get here?)