Some residents suggested that Grenfell Tower's policies were to blame for the disaster.

A newsletter put out by the building's tenant organization told tenants to follow a "stay put" policy and remain in their apartments during a fire unless the blaze was inside their apartment or in their hallway or until they were told to evacuate by officials.

This policy is in place "because Grenfell was designed according to rigorous fire-safety standards," according to the 2014 newsletter about the renovation project. New front doors in each apartment could withstand a fire for up to 30 minutes, "which gives plenty of time for the fire brigade to arrive," the newsletter said.

That policy, often followed in high-rise hotels, may be effective in lesser fires. In this case, however, the fire seemed to climb the exterior of the tower so quickly that it overwhelmed protective systems like fire doors. People who initially remained in place may have been unable to escape later because the hallways and fire escapes were filled with heavy smoke and flames.

The London Fire Brigade said crews were on the scene within six minutes of the first reports of the fire, but they were unable to reach people on higher floors to prevent fatalities.