Polish Deputy Foreign Minister Andrzej Szejna demands a criminal investigation by Israel after what he describes as the "murder" of seven food charity workers, including a Polish citizen, in a Gaza airstrike this week. "We demand a transparent, criminal and not only a disciplinary investigation, at the end of which the guilty parties will be punished," Szejna adds after Israel's Warsaw envoy was summoned and issued a formal protest over the strike on the World Central Kitchen workers. IMAGES AND SOUNDBITES