Two people have been arrested on suspicion of murdering father Gary Hampson.
One man was arrested on Saturday and one this morning.
A 57-year-old was arrested on Saturday in South London and a 60-year-old this morning.
Mr Hampson, 42, of Old Shoreham Road, Portslade, was last seen picking his ten-year-old daughter up from school and dropping her home on January 6.
Three days later his phone was switched off.
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