A high school in Oshawa is being cleared and two other nearby schools are in hold and secure as police investigate a threat that was made to one of the schools, police say.Officers with the Durham Regional Police Service were called to Paul Dwyer Catholic High School on Stevenson Road North near Rossland Road West just after 10 a.m. on Friday after the school received a threat.The school has been locked down and police say they are clearing the school to “ensure the safety of all students and staff, and there is no access to the public at present.”The details of the threat are not known.Adelaide McLaughlin Public School and R.S. McLaughlin Collegiate have been place under hold and secure.Developing story