Police are looking for two men that left the scene where a 27-year-old officer died in a road crash involving a suspected stolen vehicle.
The officer was travelling in a police car on routine patrol when the incident happened in Londonderry last night.
Two other officers in the patrol car sustained non-serious injuries.
Police have appealed for witnesses to come forward.
More top news
Scottish people celebrate the birthday of national writer Robert Burns with events including haggis throwing and the Big Burns Supper.
There will be a rare chance to see an asteroid pass so close to the Earth you will be able to see it with binoculars on Monday night.
A cold front is sinking its way southwards tonight and bringing steady rainfall for some parts of the UK.