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LONDON — A British Airways passenger jet flying from London to Chicago descended 28,000 feet in just seven minutes after declaring an emergency due to an unspecified “technical issue,” the airline said Monday.

The Boeing 777 took off at 12:15 p.m. local time (7:15 a.m. ET) but started descending just 30 minutes later while flying over Ireland, according to flight-tracking website FlightAware.