A double Israeli strike on a hospital in Gaza killed 20 people including journalists and health workers, according to the outlets they worked for, the World Health Organization, and the Hamas-run health ministry.

At least one person was killed in an initial strike, and others in a second attack minutes later as rescuers and journalists attended the scene at Nasser hospital in Khan Younis.

The five journalists worked for international media outlets, including the Associated Press, Reuters, Al Jazeera, and Middle East Eye.

Later on Monday, Israeli Prime Minister Benjamin Netanyahu called the incident a 'tragic mishap' which Israel 'deeply regrets' and said military authorities were 'conducting a thorough investigation'.

How the Attack Unfolded

The first strike hit at around 10:00 local time, medical staff at Nasser said.

There was 'mass panic... chaos', said a British medical professional working at the hospital, who was treating patients in the intensive care unit at the time.

Approximately 10 minutes later there was another blast in the same spot, the medical professional said, adding that medical staff had been planning their escape from the building when the second strike hit.

The hospital's emergency department, inpatient ward, and surgical unit was hit, according to the World Health Organization. Its head Dr. Tedros Adhanom Ghebreyesus said the emergency staircase was also damaged.

BBC Verify has seen footage to confirm these timings.

A livestream by Al Ghad TV shows several emergency workers responding to the first strike near the top floor of Nasser Hospital, as several journalists in the background film what's happening.

A staircase, where journalists often gather to broadcast from, is visible in the video. A strike then directly hits the emergency workers and reporters, sending smoke and rubble in the air.

A British medical professional described seeing 'trails of blood all over the floor' and 'absolute scenes of chaos, disbelief, and fear'.