Mechanic changed timing belt now oil is spewing out with loud rubbing noise?

What is your question?

So yesterday I picked up my car from a recomended mechanic.I drove it about three miles when I could hear a rubbing noise that sounded it was from the timing belt. I pulled into my driveway and immediately had a drip coming from the timing belt housing. What could this be. The belt makes a horribly loud rubbing noise and the oil shot all over the undercarriage of the car. I got the the mechanic to send a tow truck to pick up the car and hopefully they will fix it. Could one of the mechanics not tighten a gasket correctly?