Beltway 8 Police 4:30~ish in the AM

So had to take the fam to the airport early this morning, and as we headed north on 8, about 7 or 8 cops speed by us with lights and sirens hitting. Anyone have any ideas what they where responding too? Seems like a ton of cops for so early, and I Don't think they was responding to the warm donut sign. As far as we could tell, there was no traffic or accidents on the road.