The Armed Offenders Squad surrounded a house in Burnside this afternoon.
A local resident told chrislynchmedia.com he first noticed the heavy police presence on Gregan Crescent just after 3PM.
He said officers attempted to negotiate with those inside the property, urging them to come out.
Another resident said police instructed him to stay inside his home while they dealt with the situation.

Photo sent to chrislynchmedia.com
The road was closed off by police a resident said and there was a large police van on the street.
A police spokeswoman said the incident was in “relation to a pre-planned search warrant.
Another resident said “They had the road blocked off, and police were on the loud speaker asking occupants to come out. They used flashbangs.”
One person was in custody the spokeswoman said.
Two ambulances were sent to the scene as a precaution.