A Ryanair flight was diverted to Pisa after a huge fight broke out midair.
An elderly woman was reportedly hit in the head and a stewardess was slapped during the incident, which occurred on Thursday during a flight from Brussels to Malta.
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A number of passengers were forced to intervene to restrain the men before the captain made the decision to divert to Pisa.
One passenger, Tommy Engerer, said the situation was "terrifying". According to the Express, he said: "It was terrifying. The fight went on for so long we thought they might be trying to open the doors and might bring the plane down.
"It started when an elderly woman moved seats and told me they'd hit her on the head, then a huge fight broke out when two Belgian men tried to intervene."
According to The Sun, he continued: "They were attacking everyone around them and one of the men even slapped a stewardess in the face.
"It was chaos for about 10 minutes until there was an announcement that the plane was being diverted and passengers managed to restrain them with belts."
Mr Engerer said the men looked like they had possibly been drinking.
He added: "They were eastern European – gypsy types – but spoke a bit of French as well and were incredibly aggressive."
Four men were detained by police after the plane landed at Pisa.
According to the Metro, a Ryanair spokesman said: A Ryanair spokesman said: "This flight from Brussels to Malta diverted to Pisa after a number of passengers became disruptive inflight.
"The aircraft landed normally and four passengers were removed and detained by police upon arrival, before the aircraft continued to Malta.
"We will not tolerate unruly or disruptive behaviour at any time and the safety and comfort of our customers, crew and aircraft is our number one priority. This is now a matter for local police."