Organizers of the Global Sumud Flotilla said Wednesday that the Israeli navy is expected to begin intercepting dozens of aid boats within an hour, after declaring a state of emergency on board, as the vessels near Gaza.

They noted Israeli warships had closed in to within about 10 miles, underscoring what they called a critical moment in the mission to deliver humanitarian aid to Palestinians.

A spokesman for the Global Sumud Flotilla said the Israeli boats were moving to impose a naval blockade on the convoy.

The Israeli vessels were detected approximately three nautical miles away from the flotilla, the Global Sumud Flotilla said in a statement.

"At the current pace, we would reach their position in about 30 minutes if they don't move," the flotilla said.