The investigation into the mysterious dumping of toxic waste on Long Island is expanding after asbestos has been found at a ball field under construction on Long Island, the fourth site being probed by law enforcement and environmental officials.
Authorities say all 107 parks in Islip will be examined for contamination after the latest discovery this week.
The first three sites already under investigation by the Suffolk County district attorney include a park in Brentwood, a vacant lot in Central Islip and a row of newly built homes for war veterans in Islandia.
The original site was Roberto Clemente Park in Brentwood, where tens of thousands of tons of material were trucked in for a park improvement project. It later tested positive for asbestos. Then, the vacant lot on Route 111 was discovered and was "very similar in appearance" to what was found at the park, DA Thomas Spota said.
At the Islandia location, the homes were sold to veterans of the Iraq and Afghanistan wars. The project broke ground last year and veterans moved in about five months ago.
The group that built the homes, Long Island Builders Institute, says the three sites are linked by the same contractor.
A source told NBC 4 New York that testing of that soil began Friday.
--Greg Cergol contributed to this story