Two incidents occurred at Staten Island's South Beach: one involving a 40-year-old man on July 4 and the other involving a 37-year-old man on July 14.
On July 16 a 63-year-old woman cut her foot when she stepped on a hypodermic needle on Cedar Grove Beach in Staten Island.
"We clean the sand at our beaches daily, first by hand with a crew to remove large drift wood and other large debris washed ashore, and second by a barber rake to remove small debris," a Parks Department spokeswoman told DNAinfo.com via email. "If a needle or any type of medical waste is found, it, and the surrounding sand, are removed by a trained medical waste responder."
Parks advocate Geoffrey Croft said the department's response isn't enough.
"The administration needs to figure this out because that's a lot of stabbings within a couple weeks," Croft told NBC.
It's not clear where the syringes came from.