From the Jerusalem Post:

The Aksa Martyrs’ Brigades group announced on Sunday that it its members have succeeded in manufacturing chemical and biological weapons to be used against Israel.
In a leaflet distributed in the Gaza Strip, the group, which belongs to Palestinian Authority Chairman Mahmoud Abbas’s Fatah party, said the weapons were the result of an effort that has lasted for three years.
The statment was a response to an Israeli Security Cabinet decision to give the IDF the green light to prepare all the forces necessary for a military operation against Gaza terror cells. As of 9:00 p.m. large amounts of Golani and Givati Brigade infantry troops were amassing on the Israeli side of the Gaza security fence.
According to the statement, the first of its kind, the group managed to manufacture and develop at least 20 different types of biological and chemical weapons.