Germany faces 'political discussion' over how attack could happen

Timo Lehmann, a correspondent for German news website Der Spiegel, tells the BBC that there will be a "political discussion" over the next few days, surrounding "what went wrong and how it could happen". He says the suspect was "clearly on watch by the police, and still they couldn't stop what happened yesterday". As a reminder, Abdul Ballout had been convicted and given a prison sentence that he had not yet served. Officials said a year ago he had tried to join the