 Complete the following phrase:  Due to a lead developed years earlier by journalist Adam Goldman, the FBI reopened the case in January 2017. The new investigation involves information recently given to an agent by Venezuelan terrorist Carlos the Jackal that sometime after 1970 three American veterans sympathetic to the Palestinian cause, one of them a prominent former Black Panther, approached Mahmoud Ould Saleh, a Mauritania-born manager of the Arabic Bookshop on the Rue Saint Victor in the Latin Quarter of Paris and member of the extremist Palestinian rejection front killed in 1977. Saleh put them in touch with suspected Black September militant Kamal Kheir Beik later killed, known to have managed terror attacks including 1975 