Businesses have been urged to boycott social media firms until they crack down on terror, a report into the 2017 terror attacks says.

The Intelligence and Security Committee of Parliament (ISC) - chaired by Dominic Grieve MP - published two reports on Thursday, analysing the Westminster, Manchester Arena, London Bridge, Finsbury Park, and Parsons Green terror incidents.

Thirty-six lives were lost and many more were injured during the attacks last year, and the report considers whether mistakes were made, and seeks to ensure that all changes and improvements required have been identified.

In it, MPs said: "The system for regulating and reporting purchases of the ingredients used to make explosives was hopelessly out of date. This facilitated the perpetrators in acquiring the materials they required."

In relation to phone systems being used as a "safe haven for extremists and terrorists" the report says: "Appeals to [Communication Service Providers] sense of corporate and social responsibility have not resulted I them making the changes required...these loopholes were used by the perpetrators of the 2017 attacks."

The report states that access to extremist material online "is reported to have played a key role in the Manchester Arena attack and may have been a factor in radicalising the London Bridge attacker and the Westminster attacker".

Manchester Arena: Salman Abedi may have gained further expertise in Libya London Bridge: Khuram Butt is thought to have frequently accessed extremist material online Westminster: Khalid Masood is thought to have viewed general extremist material, although he had viewed some more extreme material on beheadings and executions on YouTube

The report described the problem of terrorists using social media as "vast".