A car bomb has exploded outside a police station in Londonderry. The mayor of Derry, Colum Eastwood, blamed dissident republicans for the attack.
"This has been going on for a while on a small scale. If there are people determined enough, even a small number will always be able to do something like this," he told the Today programme.
"But what they need to remember, and realize - they are not as determined as the rest of us".
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