This BBC news footage was first broadcast on 16th August 1961, only 3 days after the construction of the Wall began. The reporter claims that the border guards allowed some people to cross the border at this time [BBC, 2009]. The clip below is a news report from Berlin aired on 10th November 1989, a day after the Berlin Wall was opened to the people to cross freely.
BBC  The Berlin Boundary Is Sealed. [online] http://www.bbc.co.uk/archive/berlinwall/8207.shtml?all=2&id=8207
BBC  Fall of the Berlin Wall. [online] http://www.bbc.co.uk/archive/berlinwall/8224.shtml?all=2&id=8224