Gloucestershire Police say the search of the canal near Stroud for 20 year old George Ford will be stood down at sunset.
The Nottingham University student went missing from his family home in Slad Road in Stroud early on Sunday.
The search will resume tomorrow morning.
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The rare white rhino calf, named Alan after the park's electrician, is the 4th white rhino to have been born there since it opened in 1970.
The man and woman in their 20s, fell ill after mixing two domestic cleaning products in a bathroom, creating dangerous chlorine gas.
It will be a dry start to the day with sunny spells. However, thicker cloud and rain will arrive from the west during the afternoon.