Fire crews do not receive training about safely rescuing someone through "a toxic environment 20-plus floors high", an officer who went to Grenfell Tower has said.

Glynn Williams was a watch manager in charge of a team from Fulham on the night of the fire last year and co-ordinated 999 rescue information.

In a written statement to the Grenfell Tower inquiry he set out the challenges firefighters faced rescuing dozens of residents from upper floors.

The officer, who has 18 years' experience, expressed frustration at their inability to rescue more people who required fire survival guidance from call room operators.

The FSG training we receive teaches how to co-ordinate a targeted rescue to people that are unable to evacuate. We are trained to rescue that person and bring them into a safe environment.

Glynn Williams, fire officer

The fire officer described being haunted by the face of a little girl who was being rushed from the burning block. She was alone and only had pyjamas on at the time, he wrote.

Debris was falling from the side of the tower at this stage, posing a risk to those being rescued.

She looked to be in shock as her eyes were wide open. To protect her from the falling debris, I gave her my helmet before the firefighter carried her out the main entrance. The Grenfell Tower had a massive emotional impact on me and shortly after the incident I started to feel really angry that (I) did not go in and rescue someone. When I was asleep I started to have visualisations of the little girl's face who I had given my helmet to.

Glynn Williams, fire officer