Soldiers combing the area where two Palestinians apparently tried to sneak into an Israeli settlement found six Molotov cocktails, the army said Monday.
The incendiaries were discovered near the settlement of Itamar in the northern West Bank.
On Sunday night, the army said it had foiled an attempt by two Palestinians dressed in Israeli army uniforms to enter the community.
One of the suspects was detained Sunday night and the other fled toward the nearby Palestinian village of Beit Furik.
The firebombs were found near the area where the two Palestinians were spotted, the army said. It said searches were ongoing.
The army said Sunday night it was investigating whether the Palestinians had planned to attack Israelis.
The suspect who was caught had a pair of binoculars, but no weapons, the IDF said.
Troops scoured the area for the second suspect overnight, clashing with local residents in Beit Furik.
Soldiers also entered the Palestinian city of Jenin during their searches, according to Palestinian media.