The Danish police have arrested 4 people suspected of being members of the Islamic State (ISIS) and plotting to carry out attacks near the capital Copenhagen. Over 125 Danish citizens have reportedly joined ISIS after they traveled to Syria and Iraq, according to Danish intelligent services. Danish authorities tweeted that they found a cache of weapons and ammunition after investigations. According to Reuters, the arrests took place as part of an operation by Danish authorities to detect and neutralise persons recruited by terrorist groups in the Iraqi and Syrian conflict zones.