Do I need to replace my carseats?

I was in a car accident last week. I got hit going through an intersection. The impact was on the drivers side, and there's enough damage so that the passenger side doors are having difficulty opening. Fortunately, my children were not with me at the time. Do I need to replace their car seats? There is no internal damage to the car - the doors didn't cave in or anything - so the seats didn't get hit, and the kids were not in them, so the restraints shouldn't have been stressed... but I don't want to put my kids at risk. I intend to call the car seat manufacturer on Monday for more information, but wanted to see what others think...