Two men were last night charged with the murder of a teenager in the Creggan area of Derry at the weekend.
The charges came after a man in his 20s was also charged with a separate murder in Magherafelt.
A 19-year-old and a 20-year-old man will appear before magistrates in Derry today charged with the murder of Liam Devlin in Creggan at about 2.30am on Saturday morning.
Mr Devlin (19) was from Burnfoot, Co Donegal. He sustained head injuries during the incident, which took place at Linsfort Drive. He died in hospital.
He is believed to have been visiting friends in the area when the assault took place.
SDLP Cllr Jim Clifford, who represents the area on Derry City Council, said the death had stunned the community.
"The people here just can't believe that this has happened in their area. The thoughts and prayers of the community are with those who have been affected," he said.
A PSNI spokesman said they were treating the incident as murder and they have appealed for witnesses to come forward.
In the Magherafelt murder, the body of Declan McNeill (41) was found in the hallway of his home in the Glenburn Park area of Baron's Court.
A second man who was questioned about Mr McNeill's death was released without charge.