Reporters on board a cargo ship carrying activists and supplies from Lebanon to Gaza say IDF gunboats have fired on the vessel.
Reporters from Al-Jadeed and Al-Jazeera TVs say the Israeli navy fired three times on the ship. the shooting caused no casualties. The local Al-Jadeed station says Israeli troops then boarded the ship and threatened the crew.
It says the ship was surrounded by 18 Israeli gunboats demanding the crew turn back.
The IDF would neither confirm nor deny the report.
The Togo-flagged "Tali," with about 60 tons of aid and eight activists and journalists, left Lebanon Tuesday. After an overnight stop in Cyprus, it sailed on to Gaza Wednesday morning trying to reach the strip in defiance of the blockade.