Gaza, Apr 17: A medical examination showed on Thursday that metal darts from an Israeli tank shell that explodes in the air caused the death of a Reuters cameraman killed a day earlier in the Gaza Strip, doctors said.

X-rays displayed by physicians who examined the body of Fadel Shana in Gaza's Shifa hospital showed several of the controversial weapons, known as flechettes, embedded in the 23-year-old Palestinian's chest and legs.

Several of the 3 cm -long darts were also found in Shana's flak jacket, emblazoned with a florescent "Press" sign, and in his vehicle, an unarmoured sport utility vehicle bearing "TV" and "Press" markings.

Shana was covering events in the Hamas-controlled Gaza Strip for Reuters on a day of intense violence when 16 other Palestinians and three Israeli soldiers were also killed.

"The evidence from the medical examination underlines the importance of a swift, honest and impartial investigation by the Israel Defense Forces and by the government," said David Schlesinger, editor-in-chief of Reuters News.

"The markings on Fadel Shana's vehicle showed clearly and unambiguously that he was a professional journalist doing his duty. We and the military must work together urgently to understand why this tragedy took place and how similar incidents can be avoided in the future," Schlesinger added.

Several hundred people, mainly local journalists, marched in Shana's funeral procession on Thursday. His body was draped in a Palestinian flag and his shattered camera and flak jacket were borne aloft on a separate stretcher.

Two youths passing by died in the same explosion that killed Shana, witnesses said. The cameraman had stepped from his car to film an Israeli tank dug in several hundred metres away.