Engine problems forced a flight to New England to return Monday to Philadelphia International Airport for an emergency landing, officials said.

The Republic Airlines flight, operating as a US Airways Express flight, departed around 10 a.m. and was en route to the Manchester-Boston Regional Airport in New Hampshire when it experienced the unspecified engine trouble.

The Embraer 175 returned and landed safely with its 75 passengers and four crew members, said a spokeswoman for American Airlines, which has merged with US Airways.

Passengers were being accommodated on another flight.

Maintenance crews were examining the engine to determine what went wrong, the spokeswoman said.