Westminster terrorist Khalid Masood was on WhatsApp just minutes before he began his atrocity, it has been claimed.
Masood used the messaging service at 2.37pm on Wednesday, MailOnline reported.
If true, it would mean he was in touch with someone around two minutes before he sped off on his bloody mission in central London.
The revelation came as Met detectives continued to investigate whether Masood, who used a number of other aliases, acted alone or had accomplices.
Four innocent people were killed when he drove his hire car at tourists on Westminster Bridge and stabbed a police officer outside Parliament.
PC Keith Palmer, American tourist Kurt Cochran, Spanish mother-of-two Aysha Frade and 75-year-old Leslie Rhodes from Streatham died while dozens more were injured.
Police have arrested 11 people in connection with Wednesday’s attack, after raiding addressed in Brighton, London, Surrey, Manchester, Wales and Birmingham.
On Wednesday night seven people were arrested on suspicion of the preparation of terrorist acts – including three women and four men ages between 21 and 39-years-old.
On Thursday two men, aged 58 and 27, were also arrested on suspicion of preparation of terrorist acts.
Police also carried out two more arrests on Friday, detaining a 35-year-old man and a 32-year-old woman.
Ten people remain in custody.
The attack has been claimed by Isis who described Masood as a “soldier”.