Policeman slain in London attack gets Parliament honor

A coffin carrying the late PC Keith Palmer, who was killed in the London attack on March 22, is carried into the Houses of Parliament to rest overnight in the Chapel of St Mary Undercroft in London, Sunday, April 9, 2017. Palmer's funeral is due to take place at Southwark Cathedral in London on Monday. (AP Photo/Matt Dunham) (The Associated Press)

A coffin carrying the late PC Keith Palmer, who was killed in the London attack on March 22, is carried into the Houses of Parliament to rest overnight in the Chapel of St Mary Undercroft in London, Sunday, April 9, 2017. Palmer's funeral is due to take place at Southwark Cathedral in London on Monday. (AP Photo/Matt Dunham) (The Associated Press)

Pallbearers carrying the coffin of late police constable Keith Palmer, who was killed in the London attack on March 22, is carried into the Houses of Parliament to rest overnight in the Chapel of St Mary Undercroft, in London, Sunday, April 9, 2017. Palmer's funeral is due to take place at Southwark Cathedral in London on Monday. (AP Photo/Matt Dunham) (The Associated Press)

The body of a police officer killed in last month's attack in London has been brought to lie in a chapel at Parliament, an honor usually reserved for senior politicians.

Constable Keith Palmer was stabbed to death by Khalid Masood inside the gates of Parliament on March 22. Moments earlier, Masood had plowed a rented SUV into pedestrians on Westminster Bridge, killing four.

Palmer's coffin, draped in a police flag, was brought to the 13th-century crypt Chapel of St. Mary Undercroft on Sunday, accompanied by police officers and family members. It will lie overnight before his full police funeral at Southwark Cathedral on Monday.

Queen Elizabeth II gave permission for the coffin to lie in the chapel, a spot usually reserved for former British leaders.