At a preliminary budget hearing on Monday, New York City Housing Authority chair Shola Olatoye testified before the City Council that the city recently tested the water in random, vacant public housing units. The tests were conducted “out of an abundance of caution” to check for elevated lead levels.

According to court documents filed Wednesday, federal prosecutors in Manhattan are currently investigating environmental health and safety conditions, including “elevated blood-lead levels,” in public housing buildings maintained by the New York City Housing Authority.