Hammers joint-owner David Sullivan was hit by a coin as
fans protested in front of the directors' box.
It expects to issue further bans for attempted pitch
invasions and violence before the next home game against fellow Premier League
strugglers Southampton on 31 March.
The Hammers have struggled since moving from Upton Park
to the former Olympic Stadium in August 2016, winning 12 and losing 13 of their
33 home league matches there.
David Moyes' team are two points and one place above the
relegation zone.
Tighter safety and security measures, including an
increased police presence, will be in operation for the visit of Southampton.
London Stadium's Safety Advisory Group (SAG), which
includes representatives from the club, police, Newham council, and stadium
owners and operators, announced the decision after an emergency meeting last
week.
It also
warned that future trouble could lead to closures.
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