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:

31 PHOTOS
Possible terrorist attack outside UK Parliament in London
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Possible terrorist attack outside UK Parliament in London
LONDON, ENGLAND - MARCH 22: An armed police officer stands guard near Westminster Bridge and the Houses of Parliament on March 22, 2017 in London, England. A police officer has been stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard report they have been called to an incident on Westminster Bridge where several people have been injured by a car. (Photo by Jack Taylor/Getty Images)
Terror attack outside U.K. Parliament. 2 men down on road. Man with knife/machete got into Parliament and stabbed p… https://t.co/CxeL2zS6uw
Armed police respond outside Parliament during an incident on Westminster Bridge in London, Britain March 22, 2017. REUTERS/Stefan Wermuth
Armed police respond outside Parliament during an incident on Westminster Bridge in London, Britain March 22, 2017. REUTERS/Stefan Wermuth
Armed police have taken the precaution of closing the gates at Buckingham Palace, where the Queen is in residence after today's incident.
LONDON, ENGLAND - MARCH 22: Emergency services vehicles seen on Westminster Bridge on March 22, 2017 in London, England. A police officer was stabbed near to the British Parliament and the alleged assailant shot by armed police. Scotland Yard also reported an incident on Westminster Bridge where one woman has been killed and several people seriously injured by a car. (Photo by Carl Court/Getty Images)
@Reuters photographer at the scene of shootings near House of Parliament in London says at least a dozen injured on Westminster bridge
At least one body seen being covered by a blanket.
People leave after being evacuated from the Houses of Parliament in central London on March 22, 2017 during an emergency incident. Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
An ambulance is driven through a police cordon outside the Houses of Parliament in central London on March 22, 2017 during an emergency incident. Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Police officers surround two individuals on the ground inside the gates of the Houses of Parliament near the entrance, left, in London, U.K. on Wednesday, March 22, 2017. Shots were fired outside Parliament in London, and at least two people are being treated, according to a Bloomberg reporter on the scene. Photographer: Robert Hutton/Bloomberg via Getty Images
Air ambulance just landed at Parliament Square, Westminster, dozens of police cars https://t.co/TZVTO6IzDR
London's air ambulance arrives at the Houses of Parliament in central London on March 22, 2017 during an emergency incident. Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
A car on Westminster Bridge has just mowed down at least 5 people. https://t.co/tdCR9I0NgJ
We were called at approx 2:40pm to reports of an incident at #Westminster Bridge. Being treated as a firearms incident - police on scene
Incident in #Westminster: We are treating this as a terrorist incident until we know otherwise
Richard tice political campaigner tells me he can see ten bodies on westminster bridge - I can't confirm that from where I am
An armed police officer gestures as he stands guard in Parliament Square, opposite the Houses of Parliament in central London on March 22, 2017 during an emergency incident. British police shot a suspected attacker outside the Houses of Parliament in London on Wednesday after an officer was stabbed in what police said was a 'terrorist' incident. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
People leave after being evacuated from the Houses of Parliament in central London on March 22, 2017 during an emergency incident. Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
A police officer stops traffic as the Jaguar car of British Prime Minister Theresa May (R) is driven away from the Houses of Parliament in central London on March 22, 2017 during an emergency incident. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
An armed police officer guards inside a police cordon outside the Houses of Parliament in central London on March 22, 2017 during an emergency incident. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Police officers surround two individuals on the ground inside the gates of the Houses of Parliament near the entrance, left, in London, U.K. on Wednesday, March 22, 2017. Shots were fired outside Parliament in London, and at least two people are being treated, according to a Bloomberg reporter on the scene. Photographer: Robert Hutton/Bloomberg via Getty Images
Police tapes off Parliament Square after reports of loud bangs, in London, Britain, March 22, 2017. REUTERS/Stefan Wermuth
The injured being treated in New Palace Yard at Westminster Palace https://t.co/I7uRyOv2D4
Government source says PM is OK
Police trying to resuscitate one of the Commons attackers. Still seems to be breathing
House of Commons has been suspended following gunshots in Parliament, MPs are leaving the chamber
BREAKING NEWS -- Two people shot outside Houses of Parliament in London
Armed police officers stand guard inside a security cordon, outside of the Houses of Parliament in central London on March 22, 2017 during an emergency incident. Britain's Houses of Parliament were in lockdown on Wednesday after staff said they heard shots fired, triggering a security alert. / AFP PHOTO / DANIEL LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
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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:

23 PHOTOS
People post #WeAreNotAfraid and #PrayFoeLondon in wake of attack
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People post #WeAreNotAfraid and #PrayFoeLondon in wake of attack
#PrayForLondon and #Pray for all the innocent muslims who will receive the backlash from this. I do not blame you❤ https://t.co/Fg5Z0Na8DD
Such a sad thing why can't the world just be peaceful #PrayForLondon My thoughts go out to the people affected toda… https://t.co/L5OM0Ml9Rv
Breaks my heart seeing my hometown getting attacked like that. We live in one disgusting world. #PrayForLondon
#PrayForLondon I see humans but not humanity.
What's the world coming too ☹️💔... #PrayForLondon
Keep safe Britain #PrayForLondon #Wearenotafraid
#PrayForLondon OMG!! I can't belive what I'm reading!!
Wild Guess: The London terror suspect isn't a tenth generation Englishman with freckles. #PrayForLondon #LondonAttacks
Today was meant to be a day to celebrate not terror. Being so close to what happened is so scary. #dofe #gold #PrayForLondon
Can't even comprehend #Westminster. Don't want to spout platitudes. Shocked, not wanting to watch the news. Stay safe #PrayForLondon
Watching the news is giving me goosebumps 😥 it's so scary & heartbreaking 💔#PrayForLondon #Westminster
It's pictures like this makes you feel sorry and angry at the same time. #PrayForLondon #Westminster https://t.co/6uIRmVQ7FA
Islam is not terrorist #PrayForLondon
Our thoughts and prayers with the victims and families in London. #PrayForLondon
PEOPLE KILLED?! LET'S PROTECT THE GROUP OF THE PERPETRATOR! LOL #PrayForLondon #Westminster #London #WOBDSC Parlament #WeAreNotAfraid
#WeAreNotAfraid https://t.co/dN8a7Lt1QW
Londoners have withstood against the blitzs & IRA so if some pathetic terrorists thinks they are going to scare us well #WeAreNotAfraid
#wearenotafraid God bless those victims of the terrorist attack on London.
You will not make us cower in fear #WeAreNotAfraid #PrayForLondon ❤️
To all those senseless terrorists, #WeAreNotAfraid. Our prayers are with you, Londoners #Westminster
My heart is heavy tonight #London 💔 #Westminster #united #WeAreNotAfraid #PrayForLondon https://t.co/eT7an7i9oH
Emergency services and brave citizens stopped today being so much worse! Credit to every single one of them, heroes… https://t.co/gXxjihUqJO
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