People around the world unite with #PrayForLondon and #WeAreNotAfraid in wake of London attack

Millions of people have taken to Twitter Wednesday to share their support and prayers for the English capital in the wake of a possible terror attack that claimed the lives of at least four people in London, according to the latest reports.

British Parliament was locked down Wednesday morning after a vehicle plowed down pedestrians in what many are calling a "terrorist incident."

See photos and tweets from the incident:

Users on Twitter and other social media sites have united to show their support for London with hashtags #PrayForLondon and #WeAreNotAfraid.

Other users began sharing an updated version of the Westminister underground tube logo with the same "we are not afraid" message.

See more reactions to the attack here:

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