By Shereen Siewert

At least four people were injured Monday in a building explosion in the Shawano County town of Grant, officials said.

The explosion was reported at about 4 p.m. on a property on Verg Road near Hwy. M, just east of Tigerton.

Shortly after responding to the scene, officials requested four medical helicopters and evacuated four patients.

Authorities are not revealing the ages or identities of the four victims at this time.

The state fire marshal has been called in to investigate.

This is a developing story and will be updated as information is received.