Police have been made aware a suspect device has been abandoned in the Poleglass area of Belfast.
PSNI are working to establish its location.
They are asking the public to remain vigilant.
Inspector Paul Noble said: "If anyone comes across anything suspicious, they should contact police immediately on 101.”
Sinn Fein MLA Órlaithí Flynn condemned those responsible.
She said: "I condemn those responsible for this disruption as they have no regard whatsoever for the local community.
"There can be no justification for this type of activity and I would appeal to anyone with information to contact the police.”