The New York Police Department is investigating a suspicious piece of mail containing white powder that was sent Thursday to Donald Trump’s son. The letter was sent to Eric Trump’s apartment at Trump Parc East, a luxury building located on Central Park South, ABC News reports, citing a Trump organization source. The NYPD confirmed to ABC News it responded to call at the building, but declined to identify Trump’s 32-year-old son as the recipient of the suspicious mail. The letter is being examined and no one was hurt, the NYPD said. CBS News reports the Secret Service and FBI are also investigating the incident. Citing a source close to the investigation, CBS News reports the letter allegedly threatened to harm Trump’s children if he doesn’t withdraw from the presidential race.