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TrafficWatch NI is also warning the surrounding roads are also badly affected with flooding.

Traffic alert: Major flooding closes A28 between Markethill and Newry with diver...

In a statement, it added: “Road users are advised to find an alternative route for their journey. International Airport traffic may want to consider using M1, A12 and M2 as an alternative route and allow extra time for their journey.

Motorists are advised they may wish to consider an alternative route for the International Airport due to flooding on the A26 Glenavy Road. Photo by Google

Meanwhile road users are advised that the Legananny Road, Scarva, is flooded. A PSNI spokesperson said: “Although the road is still passable with care, motorists should seek an alternative route to Loughbrickland.”

Advice issued for Belfast International Airport traffic due to Glenavy Road flooding