Israeli forces have arrested an Egyptian man who crossed the border fence into Israel overnight on Tuesday, in an event the army described as "serious".
The Israeli military said it identified a man crossing the border from North Sinai into Israeli territory near the Nitzana settlement.
Soldiers detained the man and transferred him to security forces for interrogation, it said in a statement on social media.
It said it "views the incident with severity and continues to maintain a high level of defensive readiness in the area".
Egyptian authorities are yet to comment on the incident.
There have been a number of security incidents on the Egypt-Israel border since the Israeli military began its genocidal offensive in Gaza.
In June 2023, an Egyptian policeman shot and killed three Israeli soldiers after crossing the border near Nitzana.
There have been several exchanges of fire between Egyptian and Israeli troops since Israel began its genocidal offensive in Gaza.
In October 2023, an Israeli tank struck an Egyptian military position at the Kerem Shalom border crossing into Gaza. The following May, Egyptian and Israeli troops fired on each other after Israeli forces invaded Rafah.
There have been dozens of incidents involving drones, which are used to smuggle drugs and weapons over the border.
Tensions have risen between the two countries over Israel's assault on Gaza, which sparked concerns in Cairo that Israeli forces could attempt to forcibly displace hundreds of thousands of Palestinians into Egypt.
Egypt has responded by increasing military deployments in the Sinai, triggering accusations from Israel that it is in breach of the 1979 peace treaty.