The Israeli government says disruptions in the websites of the Israeli military, the Mossad intelligence agency and the Shin Bet domestic security service were caused by a technical glitch, not by a “cyber attack.”

The websites crashed Sunday, days after a shadowy group of hackers, calling themselves Anonymous, posted a video on YouTube threatening to strike back at Israel for its interception of two Gaza-bound ships.

Israeli security forces boarded pro-Palestinian ships in international waters Friday, as they were trying to break Israel's blockade of Gaza.

On board the ships were 27 activists from various countries, including the United States, Canada, and Ireland. They said their goal was to deliver medical aid directly to Palestinians in Gaza.

Israeli Defense Forces said the boarding was carried out in line with directives from the government after attempts were made to prevent the vessels from reaching Gaza. There were no reports of injuries.

Last year, nine Turkish activists were killed when Israeli commandos stormed a Turkey-led aid flotilla headed for Gaza. The confrontation caused a deterioration in relations between Turkey and Israel.