A number of roads near Dunmurry area have been closed to traffic following the discovery of a suspicious object in the Old Colin area.
Police have been tasked to the security alert, several roads have been shut and drivers are being urged to seek alternative routes.
"There's a security alert in Old Colin in Dunmurry following the discovery of a suspicious object," a PSNI spokesperson said.
"The following roads are currently closed to the Michael Ferguson roundabout - Pantridge Road, the Stewartstown Road in both directions and Upper Dunmurry Lane.
"Motorists and members of the public should avoid the area."
Sinn Féin councillor Stephen Magennis said: “This has caused major disruption and inconvenience for the local community this morning, particularly for those people travelling to work and school."