In a search near what the police said was a "criminal complex" in the city's Ein Abraham neighborhood, a Kalashnikov rifle, cartridges and a lot of ammunition were found.
The Shin Bet said she was arrested on suspicion of having contact with Hamas operatives and inciting and supporting acts of terrorism in Israel, among other charges.
The Israel Police reported that two Palestinians were arrested on suspicion of throwing Molotov cocktails containing nails at residences in the Beit Hanina neighbourhood of Jerusalem.
The investigation of the affair began in 2018 by the Investigations Department of the Competition Authority together with the Israel Police - Lahav Unit 433.
The arrests came after they were identified in the area by police from the Yehuda Crime Fighting Unit, who were working in cooperation with Border Police and the IDF
The smuggling attempt was foiled overnight when "Magen" forces with the aid of police aircraft carried out a chase of dozens of kilometers in the Egyptian border area.
The police said that the arrests came as part of a "targeted operational activity" with the aim of thwarting the activities of a criminal assassination squad in Ashdod.