Politicians have united to condemn the murder of 29-year-old journalist Lyra McKee in the Creggan, Londonderry overnight. 

Fermanagh South Tyrone MLA and DUP leader Arlene Foster attended a vigil in memory of the murdered journalist on Friday afternoon while the Green Party's Tanya Jones signed a book of condolence in Belfast. 

Mrs Foster also signed a joint statement from all the party leaders in Northern Ireland who all unreservedly condemned the murder that happened during rioting in the Creggan. 

Speaking at the vigil in the Creggan, Mrs Foster said: "Of course this is not the first time I have been in this wonderful city, but it is the first time I have been in this part of this wonderful city," the DUP leader said.

"Why did I come today? I came to stand in solidarity with all of the people who are here today.

"I want to say your pain, is my pain. It doesn't matter whether you are Catholic or a Protestant. Whether you identify as Irish or British."

"When people come out with guns to shoot people from their own community, then we have to say, enough is enough," Mrs Foster said. 

Police said the New IRA was “most likely” to be behind Ms McKee’s death.

Deputy chief constable Martin said: “As well as making an appeal today for people to come forward with what they know to assist the investigation, I have another appeal today.

“There are people in this city who will know the people they love are involved in organisations like the New IRA. I would urge those people to have conversations in their home, in their family space, in Lyra’s memory.