Need help identifying insect (wasp? bee?)

[theatreburr]

Hello all,

I'm from the Philippines. Living in the city, I generally haven't encountered too many wasps/bees... until they started getting very aggressive in our garage. Any leads on species identification would be a huge help so we can do some reading of our own as well.

These are the best pictures I have on hand of both the bodies of the insects in question as well as their gigantic hive that they've built up in a tree: 

[kevinkk]

They look like some sort of bee, not wasps. wasps don't congregate in a mass like that.
Someone here probably knows exactly what they are.