Of course:

Hamas can make the rockets it fires at Israel much deadlier by packing them with more explosives, a senior official in the Islamic militant group said in a statement Saturday. The official, Ahmed Yousef, made the threat just two days before the start of a U.S.-hosted Middle East peace conference in Annapolis, Maryland. Israeli officials have warned that Hamas may try to disrupt the conference with more intense rocket fire. Gaza militants, including Hamas members, have fired hundreds of crude, homemade rockets at Israeli border communities in recent years, killing 12 people and disrupting life along the border. In a statement sent to reporters, Yousef said that the rockets currently being fired have limited effect because they don't carry lethal enough warheads.

The good thing is that if there's an attack that causes massive Israeli casualties, the entire Israeli political leadership is overseas at a peace conference, thus limiting coordination as well as diplomatic maneuvering room. Outstanding. Simply outstanding.

References:
* Ahead of summit, Hamas threatens to make deadlier Qassam rockets [Ha'aretz]

Previously:
* Arab League: Israel Has To Move Behind 1967 Lines, Give Up Fence Protecting Itself Behind 1967 Lines
* Liberal Think Tank: East J'lem Handover Not Enough To Appease Palestinians, Will Increase Terrorism (Plus: Losing East J'lem Now Means Losing The Temple Mount Later)
* Israeli Security Foils 7 Suicide Bombings From Fatah-Controlled West Bank