Jerusalem (CNN) -- A 20-year-old man was killed on Friday when Israeli naval forces opened fire on a Palestinian fishermen along the Gaza coast, Palestinian security and medical officials said.
But the Israel Defense Forces said its forces shot at the boat after it failed to heed warning shots when it left a designated area in the northern Gaza area. It says it is now investigating claims of a casualty on the boat, which was sailing north toward Israeli territory.
The IDF said there have been other incidents of fishing boats crossing into prohibited territory and the fishermen are well aware of the regulations.
Israel has been enforcing a stiff blockade of the Gaza coast for the purpose of stopping the smuggling of weapons to Gaza militants intent on attacking the Jewish state.
The Palestinian officials identified the victim as Mohammad Beker, but did not provide further details about the incident.
CNN's Kareem Khadder and Michal Zippori contributed to this report