A man in his 60s has been stabbed to death at a block of flats in Wembley, northwest London.
The victim was found injured at Priestley House, Wembley, shortly after 10am on Saturday morning.
He had suffered multiple stab wounds and was pronounced dead at the scene.
Police said that a man believed to be the suspect barricaded himself into an address while attempts were made to save the victim’s life.
After attempting to negotiate, officers used a Taser when the suspect refused to comply with their instructions.
“The man, aged 45, was detained safely and arrested on suspicion of murder,” the Metropolitan Police said in a statement.
“It is believed the victim and suspect were known to each other.”
The force also said that its Directorate of Professional Standards had been informed because officers had attended the address three hours earlier.
“Police were called to the same location at 6.53am to reports of a noise complaint and a smoke alarm having been activated,” the Met added.
“Officers attended along with colleagues from London Fire Brigade. A man inside the property was spoken to and officers left the address.”
Detectives have launched a murder investigation and officers are in the process of informing the victim’s family.
