Warning over ice and snow on Northern Ireland roads 20 January 2013 Last updated at 17:38 The Met Office has issued warnings of ice until midnight and snow for Monday in Northern Ireland. The Roads Service has said it planned to salt roads considered to be at risk of freezing. "Our engineers will continue to monitor conditions and further salting will be carried out where required," it said. Drivers are advised to exercise caution when travelling overnight and especially when travelling on untreated roads. There are reports of difficult conditions on the roads, including the Newry by-pass. Belfast City Airport's runway was closed for a time on Sunday afternoon so that snow could be cleared from it. The airport experienced delays and cancellations due to the knock-on effect of weather problems at other UK airports. Earlier, Northern Ireland Electricity said all the homes without power due to the weather are now back to normal.