Korean Air will revised its guidelines allowing crew to react “firmly and actively against in-flight violence”, after facing criticism for its handling of an on-board incident, the South Korean carrier has announced.

Richard Marx said last week that he had intervened to help restrain a disruptive passenger on a Korean Air flight from Hanoi to Seoul.

Crew had been “ill-trained” and “ill-equipped”, the singer said.

Korean Air said it would also review the use of Taser guns on board.

The company said in a statement: “Korean Air will react more firmly and actively against in-flight violence that threatens the overall safety of the flight.”

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As part of the changes, Korean Air said it would be providing more training to staff and hiring more male flight attendants, making sure at least one male is on duty in the cabin for each flight, according to Reuters.

Richard Marx’s wife Daisy Fuentes, who was travelling with the singer, said the staff “didn’t know how to use the taser” or to secure ropes.

Taser is a brand name often used to refer to electric stun guns.

“We have decided to improve our conditions and procedure on using Taser guns to cope with violent acts and disturbances on board in a fast and efficient manner,” Korean Air added, but did not elaborate on how the rules would change.

Korean Air said that under existing rules, stun guns were permitted for use only in “grave” situations – where the safety of a flight or the life of passengers and crew were in danger.

This meant staff had been “hesitant” to use the equipment, the airline added.

Individual airlines have their own policies on what equipment they carry on board to restrain passengers.