sevdet besim , 18 , was charged with ` conspiracy to commit acts done in preparation for , or planning , terrorist acts ' on saturday afternoon .
he was one of two teenagers who officers arrested for planning terror acts .
police allege they planned to target an ` anzac day ceremony ' and police .
they are expected to be charged with a number of offences including the possession of prohibited items , with ` edged weapons ' found at a property .
another 18-year-old was also arrested and remains in custody .
three men released by police late on saturday night .
over 200 police officers raided seven properties in melbourne on saturday .