All Pittsburgh Public and West Mifflin Area schools are on modified lockdown today after an online threat was reported.
The West Mifflin Area website says the threat was made on social media and a student called the Safe 2 Say tip line.
West Mifflin was not specifically referred to.
Parents of Pittsburgh Public students received a message this morning announcing the lockdown for all district buildings.
The message also says the threat is not considered credible.