As per reports, senior western intelligence officials said that the Iranian Revolutionary Guards Aerospace Force was preparing a drone attack against Israeli-owned civilian merchant ships travelling in the Persian Gulf and the Arabian Sea.

Source: https://theshillongtimes.com/2023/04/09/amid-threats-of-attack-on-israeli-ships-by-iran-us-deploys-submarine/

On Monday, Houthi leaders announced they would attack Israel-bound or Israeli-owned ships in the waters around Yemen indefinitely until Israel ceased self-defense operations in Gaza, the Hamas stronghold.

Source: https://www.breitbart.com/middle-east/2023/12/19/houthis-threaten-u-s-red-sea-coalition-vow-no-end-to-attacks-unless-israel-lets-hamas-thrive/