A standoff between police and a man holed up with a rifle inside a northeast Harris County home ended peacefully Monday.

A SWAT team and helicopter was sent to a home in the 8700 block of Deep Valley Drive around noon after nearby construction workers told Harris County Precinct 3 Constable's deputies that the man had brandished a firearm at them "unprovoked," Chief Inspector Jorey Herrscher said.

It was not immediately clear what caused the incident, Herrscher said. The standoff was resolved peacefully around 1 p.m., he said.

Two Harris County schools were also placed on lockdown.

Cravens Early Childhood Academy and Monahan Elementary were placed on lockdown just before noon as a "precautionary method while police investigate an external situation that has occurred in the area," the Sheldon Independent School District posted online.

Everyone at the campuses is safe, the district said.