A threat to several Bridgeport schools went "viral" on social media Wednesday, prompting school officials to institute a number of immediate changes, including a two-hour delay to the school day Thursday,

A school district in Fairfield County said it is investigating after another round of posts on social media threatening violence. Bridgeport Public Schools announced on Monday, Sept. 23, that it had received more threats after receiving a round last week.

There will be an increased police presence Monday at Bridgeport schools as students return following a series of threats last week.

Schools in Bridgeport will be closed on Friday after a string of recent threats. All Bridgeport schools started class two hours later than usual and let out early on Thursday. It was just one of several safety measures the district put in place after receiving two separate threats in the span of a few days.

North Haven police are at the North Haven Middle School and High School after a reported threat. Police say they responded after a reported threat of gun violence toward the school, but there have been no reports of violence or injury at the schools.

Threats of violence at a Prince George's County high school were proven to be unfounded, but not before giving some administrators a scare on Tuesday morning. Investigators were called in early on Sept.