Police say that the pipe bomb type device located in Twinbrook on Wednesday had partially exploded.
At this time it is thought the device may have detonated elsewhere before being left in the Summerhill Drive area close to a primary school.
A number of residents as well as pupils from the primary school were evacuated by police for their safety during the four hour alert.
Detectives investigating this incident are appealing for information and would especially like to hear from anyone who believes they may have heard a loud bang or explosion possibly during the early hours of this morning.
Chief Inspector Darrin Jones, Lisburn Area Commander has condemned those responsible “Whether or not this device was left intentionally in this area or abandoned here, those who left it showed absolutely no regard for this community.
“Leaving a viable explosive device in a built up area is reckless enough but to potentially endanger the lives of small children is beyond callous.
“I am urging anyone with information or who saw they device being left or perhaps heard a loud bang to contact the investigating detectives at Lisburn CID offices by calling 0845 600 8000.”
Alternatively if someone would like to provide information without leaving their name they can contact the Crimestoppers charity anonymously on 0800 555 111.