Alliot-Marie had just blamed Israel for the Gazan violence, which she attributed to Israel's blockade of Gaza:
"...she called on Israel to lift its blockade of Gaza, saying it had increased poverty and fed violence."
It's believed that the rioters were angry, because Michèle Alliot-Marie had expressed support for releasing Gilad Shalit from captivity.
Following the meeting, Israeli radio posted a story on its Arabic-language website in which it quoted Alliot-Marie as saying that the European Union "must condemn the war crime that Hamas is comitting by keeping Gilad Shalit in captivity."
What she had actually said was that she would "pass on a message (to the EU) that the prisoner should receive Red Cross visits."