NEWARK — For the second time in as many weeks, Newark Liberty International Airport had to suspend all flights in and out of the hub because of an emergency.

The airport said before 9 a.m. Saturday that an incident had forced all flights to be grounded.

The Port Authority of New York and New Jersey said that a United flight bound for Houston had hydraulics problems and had to make an emergency landing about 8:30 a.m.

The airplane blew a tire and the runway had to be closed, officials said.

There were reports of few minor injuries.

The airport said travelers should check with their carriers before going to the airport.

Last Saturday, flights were suspended for an hour followed by an afternoon of delays after an airplane blew two tires and skidded off a runway. Several people suffered minor injuries.

Newark is one of the busiest airports in the country. This year it was ranked as the worst by an airline travelers group.

Sergio Bichao is deputy digital editor at New Jersey 101.5. Send him news tips: Call 609-359-5348 or email sergio.bichao@townsquaremedia.com.