"An armed entry was necessary due to the nature of the intelligence that we were dealing with, and involved armed officers firing CS into the address", Basu said.
The injured woman has not been arrested due to her condition, which police described as "serious but stable".
Officers say the operation was not connected to an arrest near Parliament on Thursday, when a man was detained on suspicion of terror offences.
The 20-year-old man who is understood to have accompanied the women on the bus was arrested near to the Harlesden Road address, while a 16-year-old male and a woman aged 20 were arrested at the house. "They made a total of five arrests there, and say the woman they shot was at the center of a continuing investigation".
London Police Thursday shot a woman in her 20s, north of the British capital in a counter-terror operation against a group suspected for preparing and instigating terror attacks.
Meanwhile, six people were in custody after a team of specialist firearms officers stormed an address in Willesden, north London, on Thursday night.
Another woman, aged 43, was also held in Kent.
A man is led away by police in Westminster after an arrest was made on Whitehall in central London, Britain, April 27, 2017.
The police said they believed the arrest of the man near Parliament and the raids stemming from the separate investigation had effectively contained the relevant threats to the public. Next door neighbour Alexandra Sabanov, a mother-of-one said she saw officers with "gas masks and snipers".
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The bearded suspect was taken to a south London police station where he is being held under the Terrorism Act.
"Yesterday was an extraordinary day in London", Deputy Assistant Commissioner Neil Basu, the senior national coordinator for counter- terrorism policing, said after confirming six arrests overnight.
Police recovered knives during the swoop, which took place yards from the scene of last month's deadly attack by Khalid Masood in Westminster.
MI5 and counter-terrorism police were tracking the suspect in a joint covert operation over some weeks after being tipped off by his family, Sky News reports.
The Willesden raid has been referred to the Independent Police Complaints Commission and the Met's directorate of professional standards, as is procedure.
A European security official familiar with the person said the suspect was known to British security agencies and was thought to have been inspired by the Islamic State extremist group.
Four people have now been arrested.
Further searches at linked addresses across London are under way, although the locations have not been disclosed. "We are making arrests on a near daily basis".
Thanking the public for their "continued help and support", he added: "No matter how hard we try, it is communities that will defeat terrorism and we rely on your vigilance".
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