"What is certain is that it was not an accident," Rana al-Jamal, who lives in the Palestinian city of Ramallah, told the Czech newspaper Dnes in an interview.
Her father, Jamal al-Jamal, the 56-year-old ambassador to Prague since October, was fatally wounded on New Year's day by an explosion in the Palestinian diplomatic mission's premises.
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Czech police have excluded an assassination, instead advancing the theory that the blast was caused by an anti-theft device inside a safe Jamal was manipulating. They also said unregistered weapons were found inside the mission in violation of diplomatic treaties.
Palestinian officials have given contradictory accounts.
Palestinian foreign minister Riyad al-Malki has described the death as an "accident" caused by an old safe booby-trapped to explode if opened the wrong way. But a spokesman for the Palestinian embassy said the safe in question was new, often used, and contained "no built-in anti-theft system".
The ambassador's daughter said she was convinced the explosives were put inside the safe when the diplomatic mission was recently moved from a different address in the Czech capital.
"I don't know and I won't mention anyone."