This is a developing story.

Boston Mayor Michelle Wu's plan to make big changes to two Roxbury high schools has been put on hold indefinitely.

Last June, Wu had proposed splitting up the John D. O'Bryant School of Mathematics and Science and Madison Park Technical Vocational High School, which share athletic and academic facilities.

But the proposal drew sharp criticism for its plan to move the O’Bryant, the most diverse of Boston’s exam schools, to West Roxbury, a predominantly white neighborhood.

In a joint email to parents Tuesday night, Wu, Superintendent Mary Skipper and Boston School Committee Chair Jeri Robinson noted that alternative sites for the O'Bryant school could not be found after several months of searching.

The email also emphasized ongoing problems with BPS infrastructure.

“Bringing all of our BPS facilities up to the standards that our students and educators deserve is one of the greatest challenges impacting our city,” the email read.

The email said plans for a Madison Park renovation project will continue as the O’Bryant remains at its current location through the construction.