Two separate murder investigations have been launched in London after emergency crews were called to addresses in the east and south of the capital on Friday night. The Metropolitan police said they were called to reports of a stabbing at a residential address on Lordship Lane in East Dulwich shortly after 10pm. A 36-year-old woman was found with stab injuries and died in hospital later that night. Officers are working to locate and inform her next of kin. A 49-year-old man has been arrested on suspicion of murder. Police believe those involved were known to each other. Officers were also called to an incident in Dagenham just before midnight after a man, believed to be in his 40s, was reported to have been assaulted near the junction of Goresbrook Road and Treswell Road. Despite efforts to save him, he was pronounced dead at the scene. Efforts are under way to locate his next of kin. A 38-year-old man was arrested at the scene on suspicion of murder and remains in custody. Postmortems will be scheduled for both victims. Police have asked the public to contact them if they have any information about the incidents.