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OKLAHOMA CITY – A 9-hour long standoff ended Wednesday morning when police officers entered a northwest Oklahoma City home, only to find it empty.

Around 11 p.m., police offices attempted to serve a man an arrest warrant at a home near N.W. 27th and May.

BREAKING: Standoff happening now in NW OKC near 27th & Brookline .@kfor — Ashley Legg 💪🏽 (@leggday) July 13, 2016

Police say they heard scuffling and believed the man barricaded himself inside the home.

Update: hearing reports @okcpd tried to serve someone a warrant who has now barricaded themselves inside a home in NW OKC .@kfor — Ashley Legg 💪🏽 (@leggday) July 13, 2016

SWAT and bomb squads were called to the scene around 3 a.m.

Police: tactical team in a standoff with possible murder suspect out of Tulsa .@kfor pic.twitter.com/q2S33ycq1b — Ashley Legg 💪🏽 (@leggday) July 13, 2016

Sun is up,standoff still going since around 11 p.m.Tues.Possible murder suspect out of Tulsa inside home .@kfor pic.twitter.com/0MtM42HTOv — Ashley Legg 💪🏽 (@leggday) July 13, 2016

Around 8:30 a.m., police entered the home and found it empty.

The scuffling police heard was from two dogs inside the home, officials say.

When police tried to deliver warrant they heard some scuffling inside the house.The noise was from 2 dogs .@kfor pic.twitter.com/HxfqEcING8 — Ashley Legg 💪🏽 (@leggday) July 13, 2016

The man police are looking for is 21-year-old William Proctor.

Update from our sister station KJRH in Tulsa: homicide detective is being told murder suspect in OKC standoff is William Proctor .@kfor — Ashley Legg 💪🏽 (@leggday) July 13, 2016

Proctor is wanted for murder out of Tulsa.

Police say he is considered armed and dangerous.

If you know of his whereabouts, please call police.

UPDATE: standoff is over, the house was empty. Police say murder suspect still on the loose .@kfor pic.twitter.com/6u3T3OBtS0 — Ashley Legg 💪🏽 (@leggday) July 13, 2016

This is a developing story. Check back for updates.