CLEVELAND (AP) _ Two Continental Airlines passenger jets made emergency landings nine hours apart at the Cleveland airport because of problems with hydraulic systems. No injuries were reported.

The first of the two Boeing 737s landed safely at Hopkins International Airport on Friday morning. Continental spokeswoman Karla Villalon said the problem was in the controls that steer the airplane on the ground, and the landing was a precaution.

The Cleveland-bound flight from Newark, N.J., was carrying 88 passengers.

Nine hours later, a jet carrying 47 passengers and a four-person crew left Cleveland for Nashville but returned within a half-hour when an indicator light alerted the pilot to a hydraulic problem.

Continental spokesman Ned Walker said two backup systems ensured that no one was in danger.