RAF MILDENHALL, England — A U.S. Air Force refueling plane landed safely in England after declaring an in-flight emergency Wednesday morning.

There were no injuries.

The crew of a KC-135 Stratotanker declared an emergency about 12:20 a.m. and landed at RAF Mildenhall at 1:20 a.m., the base said in a statement. .

It gave no further details about the nature of the emergency.

The 100th Air Refueling Wing, stationed at Mildenhall, has flown about 600 local refueling missions since the start of fiscal 2015.

This was not the first emergency landing for the aging tanker type this year. In January, a Stratotanker belonging to the 128th Air Refueling Wing was forced to land at Mitchell International Airport in Milwakee, after smoke and fumes appeared in the cockpit.

The KC-135 fleet has been in service for over 50 years. The Air Force is due to start replacing its fleet of 179 Stratotankers with the new Boeing KC-46 Pegasus in 2017.

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