Witness Joseph Harries told ABC News' \"Good Morning America\" that \"people were just trying to get out of the arena as fast as they possibly could after the blast. I was directly in front of the stage at the heart of the arena. I had exactly the same distance to get out of any of the doors.\"
\"I had my best friend with me and I grabbed hold of her wrist and told her never let go of me,\" Harries said. \"We just ran, we jumped over chairs, railings to get out of the doors, we had to force open doors that wouldn’t open because people were trying to get to – the entire capacity of the 20,000 person arena were trying to get out of one exit.\"
\"It felt like an eternity,\" Harries said, but it \"couldn’t have been more than two, three minutes from in our seats to outside of the arena.\"
Hundreds of police officers were on the scene overnight and transportation security was beefed up in Manchester and in other areas, according to police.
The mayors of several major cities across the globe, including those of London and New York City, also said they were reviewing their security measures as a precaution after the attack.
The British Transport Police department said extra officers would be patrol at \"key railway stations as well as on trains around the country” in the wake of the attack.
Greater Manchester Police are requesting dashcam footage from \"anyone who was in Manchester city centre\" between 8 p.m. and 11 p.m. Monday night as part of their investigation.
![\"PHOTO:](\"http://a.abcnews.com/images/International/rex-manchester-incident-18-jc-170522_4x3t_384.jpg\")
Seb Beeson/SilverHub/REX/Shutterstock
PHOTO: People watch an ambulance pass in the street near Manchester Arena after reports of an explosion in Manchester, England, May 23, 2017.
An emergency hotline was set up for people concerned for loved ones who may not have returned home, police said, and social networking giant Facebook activated its global \"safety check\" feature in the wake of the deadly attack.
The Greater Manchester Police tweeted today that officials do not believe there are any unaccompanied children at Manchester-area hotels.
A U.S. State Department official told ABC News today that the \"U.S. Embassy in London is working to determine if any U.S. citizens were affected,\" adding, \"at this time, we are not aware of any U.S. citizens killed or injured.\"
May, who will travel to Manchester today, said, \"There will be difficult days ahead.\"
May said general election campaigning would be suspended.
\"The whole nation has been shocked,\" Queen Elizabeth II said in a statement. \"I know I speak for everyone in expressing my deepest sympathy to all who have been affected by this dreadful event and especially to the families and friends of those who have died or were injured.\"
![\"PHOTO:](\"http://a.abcnews.com/images/International/GTY-manchester8-ml-170523_4x3t_384.jpg\")
Jeff J Mitchell/Getty Images
PHOTO: Members of the public lay flowers in St Ann Square, May 23, 2017, in Manchester, England.
\"I want to thank all the members of the emergency services, who have responded with such professionalism and care,\" the queen continued. \"And I would like to express my admiration for the way the people of Manchester have responded, with humanity and compassion, to this act of barbarity.\"
![\"PHOTO:](\"http://a.abcnews.com/images/International/AP-manchester-vigil-ml-170523_4x3t_384.jpg\")
Kirsty Wigglesworth/AP Photo
PHOTO: People attend a vigil in Albert Square, Manchester, England, May 23, 2017.
A spokesperson for the Manchester Arena tweeted today, \"Last night, our community suffered a senseless tragedy. Our entire team’s thoughts and focus are now on supporting the people affected and their families.
\"We are assisting the police in any way we can. We cannot praise the emergency services enough for their response and have been inspired by the way the people of this great city of Manchester rallied round last night and have continued to respond today. It shows the very best of this city.\"
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