Hamas has threatened this also. From AFP, with thanks to Twostellas:
GAZA CITY (AFP) – Radical Palestinian faction Islamic Jihad has threatened to attack US interests to avenge any harm inflicted on its leader after the United States put a five-million-dollar price on his head.
“Any harm to the secretary general of Islamic Jihad will endanger American interests everywhere in the region,” Abu Ahmed, a spokesman for Jihad’s military wing, the Al-Quds Brigades, said in a statement Tuesday.
On Monday, the United States offered five million dollar rewards for the capture of Damascus-based Jihad leader Ramadan Abdullah Mohammad Shallah and a member of Lebanon’s Shiite Hezbollah militia, Mohammed Ali Hamadei.
Both are on the FBI’s most-wanted terrorist list.
“The Al-Quds Brigades, together with all the resistance factions, will confront decisively any American stupidity against the leaders of the Palestinian people, whatever their allegiance,” the group added.
The spokesman threatened the US secret services and their agents in the region with a “wave of violent attacks targeting all American interests if they come to harm secretary general Shallah or any other symbol of the resistance.”