The experiment had reportedly been conducted during the recess and most lawmakers had not been aware of it.
The police had been able to come up with several recommendations on bolstering the parliament's security, including special barriers on the river that would prevent boats from coming near the building. An armed guard has been placed to protect the entrances from the river.
The United Kingdom has faced a number of terror attacks in 2017, such as the attack on Westminster Bridge and the Parliament grounds in London in March, and a bombing during a concert in Manchester in May.
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