Navigation signals from more than 900 vessels in the Strait of Hormuz and the Persian Gulf went awry over the weekend, creating confusion in the shipping chokepoint as the fighting between Iran and Israel intensified.

Oman and Qatar were leading efforts to begin ceasefire talks, while mediators said Iran was open to resuming nuclear negotiations if Israel’s attacks stop.

Persian Gulf shipping hadn’t been impacted by Israel’s strikes on Iran, though that could change, a British-U.S. naval task force said. The “Strait of Hormuz remains open and commercial traffic continues to