A further two key aides to Boris Johnson's in Downing Street have resigned, according to reports. 

Downing Street chief of staff Dan Rosenfield and the Prime Minister’s principal private secretary Martin Reynolds have quit.

They are the third and fourth aides to quit on Thursday, February 3 after policy chief Munira Mirza and communications director Jack Doyle resigned earlier in the day. 

According to the BBC, a statement from a No 10 spokeswoman said Mr Rosenfield had offered his resignation to the PM earlier on Thursday, but would stay on while his successor was found.

Mr Reynolds will do the same, but then return to a role at the Foreign Office.

Following the resignation of Munira Mirza, Dominic Cummings tweeted; "Pretty soon there will be a mad scramble & ministers will be kicking themselves hitting their heads saying 'WHY didnt i move faster arghhh' [sic].

"Nows [sic] your moment, find a flicker of moral courage & 'push what is falling'"

READ MORE: Boris Johnson's policy chief Munira Mirza resigns over Jimmy Savile remarks

Jack Doyle quits Downing Street amid Boris Johnson's Savile comments

The resignations come after 17 Tory MPs submitted letters of no confidence to Mr Johnson. 

A total of 54 letters are needed to trigger a leadership contest. 

Who has resigned?

Here is everyone that has resigned so far: 

  • Dan Rosenfield - Downing Street chief of staff
  • Martin Reynolds - Prime Minister’s principal private secretary
  • Munira Mirza - policy chief
  • Jack Doyle - communications director