A reward of up to £10,000 is being offered for information on the murder of Lyra McKee.
The 29-year-old journalist was shot dead during rioting in Londonderry last week.
A dissident republican group calling itself the ‘New IRA’ has admitted responsibility.
The reward for information leading to a conviction is being offered by the independent charity Crimestoppers.
It can be contacted on 0800 555 111, or through the Crimestoppers-uk.org website.
A spokesperson said: “This murder has sent shockwaves through the local community and across Northern Ireland. Indeed it has attracted global condemnation.
“Ms McKee was merely doing her job as a freelance journalist.
“We know that this has affected all parts of the community and we urge anyone who has information about those who are responsible to come forward.
“By contacting Crimestoppers, you stay 100% anonymous. Always. You can pass on what you know, safe in the knowledge that you’re doing the right thing.
“No one will ever know you contacted us and you may also be entitled to a reward."
Police say there has been “outpouring” of support so far, with over 140 people coming forward with evidence to assist their investigation.
They believe information that could bring Lyra McKee’s killer to justice is “out there”.