POLICE are thwarting up to four planned dissident republican attacks for every one the extremists manage to pull off, a senior police commander has said. The officer leading the fight against the violent renegades said a hard core of veteran terrorists are directing hundreds of active dissidents in their campaign of violence. Will Kerr, assistant chief constable of the PSNI, said the dissidents' widening attack capabilities, ranging from car bombs to rocket fired grenades, were "deeply concerning". But he stressed their activities also needed to be put in "[...]