Two more Valparaiso-area homes were hit by gunfire Monday night, causing damage to the houses, but sparing residents inside from injury.

Monday's incidents came after a weekend in which four homes and a school in east Porter County and LaPorte County were shot up. Police said they're aggressively pursuing all leads.

"It's imperative that this stops before somebody is seriously injured or killed," said Porter County police Lt. Chris Eckert said.

Both of Monday's shootings occurred shortly before 6 p.m. in the 400 block of north County Road 250 West in rural Valparaiso. One of the homeowners, John Gast, told police he was home with his wife and two children, ages 6 and 10, when the children approached him, frightened, saying the home had been shot.

Police determined the home had been struck four times, with one of the bullets entering the kitchen where his wife was. Another bullet entered a child's bedroom, but she wasn't in there at the time. The damage is $370.

The other homeowner, Phyllis Johnson, told police she heard a loud pop, then saw a hole in the wall. Right before hearing the pop, a vehicle with a loud muffler passed.

Those shootings came one night after someone driving along Ind. 2 fired multiple shots into Washington Township High School and two homes, riddling the structures with bullets. A day before that, bullets were fired into two homes in LaPorte County.

Eckert hopes the reward of up to $1,000 being offered in the shootings will prompt someone with information to come forward. Anyone with information about the shootings is asked to call Crime Stoppers at (800) 342-7867 or Porter County police at (219) 477-3139.