A top Polish military official revealed that a Russian missile may have entered his country’s airspace before striking Ukraine, according to a report.

“Everything indicates that a Russian missile intruded in Poland’s airspace,” Gen. WiesÅ‚aw KukuÅ‚a, Poland’s defense chief, said. “It was monitored by us on radars and left the airspace. We have confirmation of this on radars and from allies [in NATO].”

Polish President Andrzej Duda called an emergency security meeting after the object appeared on radar, and 200 police officers have searched the area near the town of Hrubieszow where the radar detected the object in case it landed in Polish territory, the BBC reported.

Poland’s defense forces said the object penetrated about 24 miles into its airspace and left it after less than three minutes.

White House national security adviser Jake Sullivan addressed the incident with Jacek Siewiera, the Polish Secretary of State and head of the National Security Bureau. Sullivan made clear the U.S. would support Poland and offered technical assistance “as needed,” according to a readout of the conversation.

Sullivan also assured his counterpart that President Biden is following the issue closely, for which Siewiera expressed appreciation as he confirmed the two governments would remain in close contact on the issue.