A human chain was formed on both the west and east sides of the bridge as part of a vigil in solidarity for the four victims killed in last Wednesday's assault on Parliament.
Masood, 52, killed three pedestrians with his vehicle, before fatally stabbing a police officer on March 22.
The bridge, still adorned with floral tributes to the victims, was closed to traffic while the Hands Across Westminster Bridge vigil took place.
Mr Bercow said: "Members will also be aware that 2.40pm today marks a week on from the shocking events of last week, and our thoughts will be in particular with the Metropolitan Police as they mourn their colleague Pc Keith Palmer". "This is not being treated as suspicious".
PC Keith Palmer, 48, was stabbed, American tourist Kurt Cochran, 54, and Aysha Frade, 44, died from multiple injuries that afternoon and retired window cleaner Leslie Rhodes, 75, died later in hospital of his injuries. "Linking all nations, faiths, orientation and sexes".
Dartford-born Khalid Masood killed four people in his murderous spree through Westminster.
Masood went on to fatally stab a policeman before being shot dead on the grounds of Britain's Parliament.
Regarding the police's ongoing inquiry into last week's attack, Mackey said detectives still believed Masood had acted alone.
Adjourning the inquest for police to carry out their investigations, Dr Wilcox told the family members in the court: "I wish you all well".
The later previously said she had "shed many tears" for her son's victims.
Police say there's no evidence that Masood was directly linked to the Islamic State group or al-Qaida.
He confirmed that the attacker had been formally identified as Khalid Masood, 52, from Birmingham.
The mourners also observed a minute's silence at the very moment on Mar 22 when Khalid Masood ploughed his auto into a crowd in a rampage that killed three people on Westminster Bridge in the shadow of Big Ben.
One 30-year-old man remains in custody; a second man was released without charge Wednesday.
Mr Cochran was killed and his 46-year-old wife was taken to hospital with a broken leg and rib and a cut head.
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