Chemical Weapons Used Against Israel?

Reuters reports that the al-Aqsa Martyrs Brigade claims it fired a chemical weapons-tipped rocket into Israel. IDF currently has no comment, but that they would claim such a thing is pretty remarkable. Most importantly, it shows that Mahmoud Abbas, "President" of Palestine and head of the Fatah movement, isn't able to control his own militants. With the passing of Sharon and the old guard, the Palestinians had an opportunity to make a cogent press for statehood - instead they've resorted to violence against Israel and among themselves...typical.