Four Jordanians arrested in Jordan in April had planned to perpetrate terror attacks in Israel in retaliation for Operation Cast Lead, DPA reported on Wednesday. According to the report, judicial sources told the news organization that the four were expected to be charged with illegal possession of arms. The suspects were named as Sakhr Abu Zaid, Hassan Talaq, Mohammad Abu Ourah and Osama Abu Kabir, the report continued, adding that Abu Kabir had been incarcerated at Guantanamo Bay prison for several years. The IDF launched Operation Cast Lead in December 2008 in an effort to stop incessant Palestinian rocket fire against southern Israel. Over 1,000 Palestinians - many of them gunmen - were killed during the operation. Ten IDF soldiers and three Israeli civilians were also killed. In mid-April, the IDF beefed up forces along the Israeli borders with Egypt and Jordan out of concern that terror cells operating on either border would infiltrate into Israel. Egypt also boosted its forces at the time. Later in the month, Egypt announced that it had uncovered a plot by 49 men with links to Hizbullah to destabilize the country by carrying out attacks on Egyptian institutions and Israeli tourists.