The military on Tuesday said its forces in south were on increased alert after the arrest of a senior Islamic Jihad operative on Monday.
Train service in the Ashkelon area has been suspended and some roads along the border were closed, out of concern for possible anti-tank fire from Gaza.
IDF forces arrested Basam al-Saadi, the West Bank leader of the Islamist terror group in Jenin Monday night.
One Palestinian was killed in a fire exchange with the soldiers.