UPDATE @ 10:55 p.m.: Police are on scene with a K-9 and they are searching the house.
We're being told police are executing a search warrant at the address. And now crime scene tape has been put in place around the house.
The special police military vehicle that was in the front yard earlier tonight has left the scene.
Police are no longer blocking North Shaffer Street.
We're hearing there may be a police standoff in the 300 block of North Shaffer Street in Springfield.
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Springfield police cruisers and a police Emergency Response Team, using a large black military-style vehicle, have been brought to the scene. It's in the front yard, according to the caller.
A caller tells us his daughter and he have heard police on bullhorns or some other voice amplification device imploring a man to leave the residence.
The caller estimates that police have been at the house at least 20 to 25 minutes.
The caller also said the street has been blocked off to traffic.
We're headed to the scene and we'll update this report as we get information.
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