X-Men: Apocalypse Trailer Breakdown - 40 Things You Need To See

20. The Four Horseman Infiltrate Cebrebro

Worryingly for the X-Men, the entire Apocalypse group have infiltrated the mansion (presumably after making sure they blow up a few kids on the way in) and are attempting to gain access to Cebrebro themselves. That would suggest that Apocalypse wants to locate every mutant to help with his grand scheme.