Italian counterterror police forces raided several locations late Tuesday night and arrested four Islamic radicals who planned to blow up Venice's Rialto Bridge, one of the city's most visited sites, and kill hundreds of tourists. Venice's chief prosecutor also disclosed Thursday that the authorities had been secretly monitoring the communications of the terror cell members, all citizens of Kosovo linked to ISIS. The radicals were heard expressing joy regarding the March 22 terrorist attack in London, the prosecutor said.