British interior minister Amber Rudd said "encryption on messaging services is unacceptable"

Technology companies must work together more with law enforcement agencies and should stop offering a "secret place for terrorists to communicate" using encrypted messages, The British minister said on Sunday.

which was reported by some local media that  British-born Khalid Masood sent an encrypted message moments before killing four people last week by turn over his car into pedestrians and fatally stabbing a policeman as he tried to get into parliament in an 82-second attack that struck terror in the heart of London.

It can be difficulties in taking on technology companies - in the U.S, officials have been trying to make U.S. technology stand firms provide a way around encryption, talks that have intensified since a mass shooting in San Bernardino.

But while saying British interior minister Amber Rudd was "calling time on terrorists using social media as their platform", Rudd also call upon for help from the owners of encrypted messaging apps such as Facebook's WhatsApp, backing away from seeking to introduce new legislation.

Rudd said: "It is completely unacceptable, there should be no place for terrorists to hide. We need to make sure tecnology organizations like WhatsApp, and other social media tecnology companies like that, would not provide a secret place for terrorists to communicate with each other."

she said "We need to make sure that our intelligence services have the ability to get into situations like encrypted WhatsApp."According to technology magazine Wired, end-to-end encryption means messages can only be decoded by the recipient and not by anyone in between, including the company providing the service.