Students at Kingston University London needed to go away a part of the Penryhn Road campus at the same time as officers look into.
The Met Police stated it turned into known as at 09:15 BST on Thursday and had asked for assist from the Ministry of Defence.
A cordon in region in Fassett Road closed two close by polling stations.
At approximately 20:30, police said approximately 1,500 homes had been evacuated as a precaution with cordons anticipated to remain in location until Friday afternoon.
Commander Mark McEwan stated: “Rest centres and assistance are being provided via our partners. The operation is possibly to keep at some stage in the night time.”
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At 11:30, Kingston University stated the campus could “be closed for the relaxation of the day”.
A spokesperson brought: “All body of workers and college students based totally at Penrhyn Road may work home. Be prepared that the campus may also be closed the following day.”
By the afternoon, the cordon have been prolonged to cover the Knights Park campuses, the University’s nursery and some pupil halls.
Kingston Council showed two polling stations getting used for the European elections have been closed while the tool is dealt with.
St John the Evangelist Church in Grove Lane were moved to St Mark’s Church in Surbiton and St Raphael’s Catholic Church Hall in Portsmouth Road were moved to Glenmore House, The Crescent.