Three police officers injured in the Westminster attack have been named as PC Kris Aves, PC Roger Smith and PC Bradley Bryant, according to reports.

PC Aves is in a stable condition, but there are other reports he has life-changing injuries.

PC Smith is also said to be in a stable condition following an operation after suffering a leg injury.

PC Bryant suffered minor injuries and has reportedly been released from hospital.

It is reported the three officers, based in Lambeth, South London, were wounded on Westminster Bridge as Khalid Masood – a Muslim convert born Adrian Russell Ajao – drove a car into pedestrians.

PC Palmer, 48, died from injuries he sustained when he confronted Masood as he tried to get into the Palace of Westminster a few moments later.

PC Aves is reported to have undergone hours of surgery on what are described as life-changing injuries, but it is not clear what they are.

His sister Nikki Tapner, 42, told The Sun: I don’t know that much about what’s going on.

All I have been told is he has been hurt but his life is not in danger. My parents are there with him.

PC Roger Smith, in his early 50s, also suffered leg injuries and underwent an operation in hospital, while PC Bradley Bryant was reportedly discharged following treatment for more minor injuries.

The officers had just been to a commendation service at the Met’s new HQ in Cannon Row.

They were crossing the bridge when they were hit by a Hyundai 4×4 being driven by Masood at high speed along the pavement.

One former colleague told the Mirror newspaper: By all accounts the officers were unaware of what was happening until the car was literally on them. It came out nowhere.

Three civilians also died after Masood drove the car into pedestrians on Westminster Bridge.

They have been named as teacher Aysha Frade, who was on her way to pick up her children from school; US tourist Kurt Cochran, who was celebrating his Silver wedding anniversary; and 75-year-old Leslie Rhodes from Clapham, south London.

The investigation into the attack is focusing on whether Masood, who used encrypted instant messaging service WhatsApp just before his deadly attack, acted alone.

(c) Sky News 2017: Westminster terror attack: Three injured police officers named