But with as many as 600 people living in the 120 flats in the block, there are concerns the casualty and fatality numbers will rise.
At least six persons have been confirmed as dead following Wednesday's heavy fire that engulfed a tower block in west London.
Some 200 firefighters and 40 fire trucks were deployed to the scene and emergency workers were battling to get the fire under control. It said the causes of the fire would be fully investigated. "There were a lot of people hanging out of the windows, screaming, crying for help", he says "There was this one window where they'd tied bedsheets together to make a makeshift rope-two people were hanging off the rope".
The "horrendous" blaze struck the 27-storey Grenfell Tower in Latimer Road, White City, in the early hours of Wednesday morning.
"We saw people looking out the window screaming, 'Help!"
The blaze was mostly contained around 5 a.m. BST, though smoke reportedly poured from the building for hours after.
The cause of the fire has yet to be determined, but the New York Times reports that a residents' group had complained about "fire hazards in the building and what it called inattention by the landlord". He says there was heavy smoke in the hallway and he couldn't find the stairs.
Describing the harrowing scenes that he saw, Terry said: "It was nearly like 9/11... the amount of flaming debris because to get into the building we had to run the gauntlet of flaming debris".
"Unfortunately, the Grenfell Action Group have reached the conclusion that only an incident that results in serious loss of life of KCTMO residents will allow the external scrutiny to occur that will shine a light on the practices that characterise the malign governance of this non-functioning organisation".
"We have taken 30 patients to five hospitals", London Ambulance Service said.
"The crews are doing all that they possibly can to tackle this fire".
Residents said the fire was on the exterior of the building, which had been covered in cladding in a major refurbishment completed previous year.
An interviewee told local radio that the fire started at the fourth floor, but the smoke alarms had not gone off. "In my 29 years of being a fire fighter I have never, ever seen anything of this scale".
The minister said: "My thoughts are with the residents and families of everyone caught up in this awful event".
The Metropolitan Police confirmed an evacuation attempt is still underway and that a number of people are being treated for a range of injuries.
The area around Grenfell Tower is home to a large number of Muslims.
"There will be a great many questions over the coming days as to the cause of this tragedy and I want to reassure Londoners that we will get all the answers", Khan said in a statement.
Mayor Khan said the advice would be looked into.