Transporter 1990 oil pressure
 

Started the van this morning to embark on our jollies, pulled away and battery light stayed on. We drove for a few more yards then noise from engine like something broke, then oil pressure light came on and buzzer. Pulled to a stop and discovered the belt broken so replaced this but the oil pressure light and buzzer still on. Has anyone any clue why this would be so, are the two incidents connected, is my van broke? How can I fix it?
Thanks, Daniel