Police are searching for a man who apparently walked into a southwest Calgary charter school and exposed himself to students.

It's alleged to have happened Wednesday afternoon at Westmount Charter School, as students were being let our for the day.

The school located on Richmond Road near Crowchild Trail S.W. was put into lock down for nearly two hours while police investigated.

Police searched the school but did not find anyone suspicious inside.

Meanwhile anxious parents waited outside not knowing exactly what was happening.

"I just hope the all the kids were doing ok. And we didn't know, we didn't know what was going on right, so it was pretty scary." Muny Danji told CTV News.

By 5:20 p.m. police allowed students to leave the school, investigators estimate there were a few hundred inside.

Merv Kurtz, the school's superintendent told CTV News, staff have met with the students involved, "We will provide counselling to them tomorrow. We will be advising our staff in the morning as well of the incident and review the procedures that took place today."

The school has asked police to step up patrols in the area; it also sent a note home to parents saying, "We will be in a heightened state of awareness in the coming days. We are asking that grade 7-12 students stay on campus for lunch time. We remain committed as ever to providing a safe environment for our student community. "

Police have released a description of the suspect though. They say he is a tanned white man between the ages of 20 and 30. He is about 180 cm (5'11") tall and was wearing a blue and white jacket/trench coat and blue jeans.

Anyone with information about the suspect should contact Crime Stoppers at 1-800-222-TIPS(8477).