ST. PAUL, Minn. (AP) - St. Paul school officials say they are disturbed by allegations that a former janitor engaged in improper behavior with students in recent years.

The remarks come as 62-year-old Walter Happel faces new charges. Happel resigned from his job at Linwood Monroe Arts Plus school in February after authorities began a criminal investigation into his behavior.

In a statement Wednesday, St. Paul schools CEO Michelle Walker said the district is sorry and feels "terribly that this happened."

In March, Happel was charged with peeking at an 11-year-old boy in a bathroom stall at Linwood Monroe. On Tuesday, Happel was charged with various counts of criminal sexual conduct.

Five of the new cases involve students from Linwood Monroe.

Bail for Happel is set at $245,000. Online court records do not list a defense attorney.