TWITTER Police search a man after making an arrest during a vigil in Nice

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The man was reportedly armed with a large knife when he attended the vigil for the 84 victims of last night's massacre. Police are said to have arrested the man quickly. Eyewitnesses said he was carrying 'a machete'.

Others said people screamed and others were left in tears as police put the man in a police car. Vigils are being held across France this evening as President Francois Hollande warned the death toll could rise with a further 50 victims in a critical condition. France has declared three days of national mourning following the atrocity, which comes after attacks in November in Paris in which 130 died and in January 2015 that killed 17. A vigil was also taking place at Nice Cathedral tonight.

Members of the #NiceAttack crowd were crying. News crews chased cop car down the street. pic.twitter.com/NHCyi5SsUq — Ryan Broderick (@broderick) July 15, 2016

Crowd screamed at him as he was put in police car pic.twitter.com/fR0oe2mrPA — Ryan Broderick (@broderick) July 15, 2016

France has been hit by a tragedy once again Francois Hollande

President Francois Hollande said: "France has been hit by a tragedy once again. This monstrosity of using a lorry to deliberately kill people, many people, who only came out to celebrate their national day. "France is in tears. It is hurting but it is strong, and she will be strong, always stronger than the fanatics who wish to hurt us." French authorities tonight confirmed 202 people were wounded including 25 who are on life support. The arrest at the vigil comes nearly 24 hours after French-Tunisian Mohamed Lahouaiej Bouhlel ploughed a truck into hundreds of people celebrating Bastille Day in Nice.

AFP GETTY Hundreds of people have attended vigils across France

AFP GETTY People console each other at a makeshift memorial to pay tribute to the victims

AFP GETTY Vigils have been held across France this evening

EPA People gather in front of a memorial on the Promenade des Anglais in Nice

Crowds, at some places five people deep, had packed out Nice's Promenade des Anglais to watch a glittering fireworks display when the lorry struck. The white HGV sped down the road and rammed into the crowd where it was thickest at about 40mph. Bouhlel drove the truck along the kerb for 100 metres, reportedly dodging officer's gunfire. He then burst out of the vehicle and began spraying the crowd with bullets before he was shot dead. Revellers in the resort initially thought the commotion was part of a celebratory firework display, but then saw the lorry and assumed the driver had lost control. Irish barman Robert Greene, from Coolock in Dublin, was around three metres from the bloody carnage and spoke of the devastation.

Pray for Nice: The world pays tribute to victims of Bastille Day attack Mon, July 18, 2016 Gabby Logan, Simon Cowell and Justin Timberlake lead tributes to the 84 victims of the horrific terrorist attack in Nice, France on Bastille Day. Play slideshow REUTERS 1 of 37 A general view shows the crowd gathering on the Promenade des Anglais during a minute of silence on the third day of national mourning to pay tribute to victims of the truck attack in Nice

Mr Greene said: "I saw this truck and he cut through three or four people, he was already missing the bumper. It was horrific. "A woman dropped to her knees, someone in her family had been killed, just lying there. There was not even a thing anyone could do, there was no CPR, bits of him were lying around. "It was horrific. "There was a young child's plastic tricycle, smashed up and left in bits. "I stayed on top of the stairs looking around. It was surreal. People screaming, children crying, young children running around the place alone, a woman on rollerblades screaming for her child."

Bastille Day Massacre: 84 dead Sat, July 16, 2016 84 people have been killed and 100 more injured in the southern French city of Nice after a lorry was 'deliberately driven' into a crowd celebrating Bastille Day in a confirmed terrorist attack. Play slideshow REUTERS 1 of 25 French President Francois Hollande giving a statement following the attack in Nice, during a national television address in Paris