This is the moment a Good Samaritan scales a burning building and rescues two children trapped in a smoke-filled bedroom.

The blaze affected two second-storey units in the city of Mesa in Maricopa County in the US state of Arizona on 19th February.

Mesa Fire Department said the units were fully engulfed by the time they arrived on the scene.

Meanwhile, local residents informed the police that two adults managed to escape one unit, saying that their two children, aged 6 and 2, were trapped in a back bedroom on the second floor.

The police and a citizen, who wished to remain anonymous, went to the back of the unit and managed to use a storage shed to get close to the children’s bedroom window.

The unnamed man was able to pull out the window frame and climb into the bedroom before handing the two children down to waiting officers, as seen in the dramatic footage.

The fire brigade managed to contain the blaze from the building’s roof. Two police officers were hospitalised for smoke inhalation.

The police said the two children were also taken to hospital with minor injuries, adding that the outcome could have been very different if not for the Good Samaritan’s actions.

The authorities said he first saw the blaze from a distance and scaled a wall to the apartment complex before running towards the flames to help.

The man wished to remain anonymous, saying it was his only objective to rescue the children if he could.

The cause of the blaze is still under investigation.