In a statement, a spokesperson for the Met Police said: “We understand five officers were injured and are receiving treatment.
“We await an update on the extent of their injuries.
“At this stage, we don’t believe any members of the public were involved or injured.
“The circumstances of the incident will be thoroughly reviewed, but at this stage our priority is the wellbeing of the officers involved.”
A Port of London Authority spokesperson said: “We are aware of an incident involving a police vessel at Westminster Bridge.
“We are supporting the response and providing assistance where needed, working closely with the Metropolitan Police, HM Coastguard and partner agencies to manage the situation.”
A police helicopter and an air ambulance were circling above.
Some entrances to Westminster Underground station have been shut, Transport for London has confirmed.
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