Northern Ireland Water said the threats were "unwarranted, unprovoked and unnecessary"
Media playback is unsupported on your device
Video

NI Water workers threatened again in Belfast

A north Belfast assembly member has said that Northern Ireland Water workers have been threatened for a second time in 24 hours.

The company said earlier it had to withdraw one of its contractors in west Belfast after they were threatened.

BBC News NI's Will Leitch reports.