From the New York Post [caution tabloid]:

An Israel-bound passenger plane pilot was reportedly stabbed several times by the jet’s co-pilot in the cockpit — and the terrifying scenes caused the aircraft to plunge almost 20,000 feet in minutes, sparking fears of a “terrorist attack in mid-air.” The jet, which departed Dubai for Tel Aviv just before 7 a.m., was cruising at around 34,000 feet before violence broke out in the cockpit around two-and-a-half hours into the flight, Israel’s Channel 12 reported.
The co-pilot tried to take control of the Boeing 737 Max 8 plane, which was carrying 174 passengers including 27 children, and attacked the pilot several times, the outlet reported. “We were either going to crash or be murdered,” one passenger told I24 News.