Mubarak arrived in a helicopter earlier today to New Cairo's Police Academy ahead of an expected verdict.
Several of Mubarak's supporters and opponents gathered outside the Police Academy, where Cairo's Criminal Court was expected to issue its verdict in the retrial.
Families of the victims held pictures of relatives they lost while Mubarak supporters chanted slogans questioning whether Egypt had really improved following Mubarak's ouster.
Mubarak, 86, is being retried on charges of complicity in the killing of around 850 unarmed protesters during the January, 2011 uprising that ended his 30-year rule.
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The former autocrat was sentenced to 25 years in jail in 2012 but the verdict was successfully appealed in January, 2013 as the presiding judge ruled that there was not enough evidence presented by the prosecution.
Mubarak's retrial began in April, 2013.
Egypt has been wracked by political turmoil since the overthrow of Mubarak and later under its first democratically elected President Mohamed Morsi of the Muslim Brotherhood.
Morsi's term was plagued by political uncertainty and violence in a deeply polarised country that ultimately led to his ouster by the powerful military on in July last year following mass protests against his rule.