RT News - September 16, 2017 (17:00 MSK)

UK police arrest an 18-year-old in connection with Friday's bomb blast on the London Underground. Islamic State claims it was behind the attack that left 29 people injured. In a show of defiance against the Spanish government, Catalan officials throw their support behind the region's upcoming independence referendum. Large crowds of people also turned out in support of Catalonia's secession. And, talks in Kazakhstan on the Syria crisis yield a crucial agreement for de-escalation zones in the war-torn country. It includes one in the mainly opposition-held Idlib province.