A pensioner, aged about 80, is suffering head injuries after a group of men broke into his Islington home.
Police arrived at the scene at 9:30am and arrested three men, aged in their 20's, as they tried to flee the property.
A fourth man, aged 18, climbed on top of the roof and stayed up there for nearly three hours, throwing items down.
The stand off ended when he fell down and was taken to hospital with non-life-threatening injuries.
The pensioner's injuries are also non-life-threatening.