The suicide vests used Friday by attackers in Paris -- a first in France -- were made by a highly-skilled professional who could still be at large in Europe, intelligence and security experts say. . . "Suicide vests require a munitions specialist. To make a reliable and effective explosive is not something anyone can do," a former French intelligence chief told AFP, speaking on condition of anonymity. "A munitions specialist is someone who is used to handling explosives, who knows how to make them, to arrange them in a way that the belt or vest is not so unwieldy that the person can't move," he added.
"All seven of the assailants who died in attacks wore identical explosive vests and did not hesitate to blow themselves up -- a worrying change of tactic for jihadists targeting France. . . French authorities say the vests appeared to have been made with TATP, or acetone peroxide, that is easy for amateurs to make at home but is highly unstable. . . Making a vest cannot be simply learned over the Internet. . . "It can't be done in a couple of days," said the former intelligence chief. "It takes weeks of training, and you have to work under the watch of a 'master'. It's meticulous work."