The Jordanian Royal Navy arrested an Israeli who entered Jordanian waters on Saturday, the navy announced on Sunday.
The detainee had been attempting to swim across into Jordan via the Dead Sea.
The IDF later confirmed that a report had been received on Saturday of an Israeli civilian who crossed by sea from Israeli territory into Jordanian waters and was subsequently detained by Jordanian forces.
"Israeli security authorities have been working through the relevant channels to ensure his safe return," the IDF added.
This is a developing story.