The police force on Tuesday reiterated the incident is "not currently being treated as terror-related and we are not looking for anyone else in connection with it".
Liverpool's 30-year wait for their 19th English top-flight title ended on Thursday after second-placed Manchester City were beaten by Chelsea, giving Juergen Klopp's side an unassailable 23-point lead with seven games left.
Liverpool continued their relentless march to a first English title in 30 years, easing to a 2-0 victory at West Ham United on Wednesday to move 19 points clear at the Premier League summit. Mohamed Salah fired them ahead from the penalty spot in the first half and Alex Oxlade-Chamberlain doubled their advantage early in the second to wrap up a remarkable 23rd win from 24 games this season and stretch their unbeaten league run to 40.
Images from Wednesday's action in the UEFA Champions League.
first English title for 30 years had been sealed almost a month ago with seven games remaining, following a three-month stoppage because of the COVID-19 pandemic.
Champions Liverpool are five points clear at the top of the Premier League after a 7-0 away hammering of Crystal Palace while Arsenal's troubles continued with a 2-1 defeat at second-placed Everton on Saturday.
This was not quite Liverpool back to their best but it was an important statement of intent for Klopp's side that they will not be giving up their title without a fight.
Goalkeeper Alisson Becker scored a stunning header in the fifth minute of stoppage-time as Liverpool snatched a 2-1 victory at the death against relegated West Bromwich Albion at The Hawthorns on Sunday.
Liverpool raised the bar so high and enjoyed such a huge winning margin in claiming the English Premier League title last season it would be churlish to doubt their credentials for a repeat showing.
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A summary of Saturday's action in the English Premier League.
Liverpool will resume their quest for a first top-flight title in 30 years against Everton on June 21 but the venue for the behind-closed-doors fixture was not confirmed when the league released its revised fixtures for the season's restart.
Liverpool fans went into a tizzy and the COVID-19 pandemic no deterrent, they thronged the streets in numbers, celebrating with flares, placards. Here's a look at how fans are celebrating...
Ruthless Arsenal threw down the gauntlet in the Premier League title race with a 5-0 thrashing of London rivals Chelsea to roar three points clear at the top of the table on Tuesday.
Images from the Champions League football matches played on Wednesday night.
Colombia, who have qualified for the quarter-finals, top Group D with six points after two matches, with Brazil in second on four points.
Liverpool 'disappointed' after fans celebrate league win outside Anfield
Klopp's side won the Champions League, Super Cup and Club World Cup titles last year, but the German said that their rivals will look to close the gap.
Nine players from the Premier League have been called up including Ruben Dias, Diogo Dalot, Bruno Fernandes, Bernardo Silva and Diogo Jota. Goncalo Inacio is the only Sporting player in the squad.
A summary of Saturday's matches in the Premier League.
Arsenal returned to the top of the Premier League with a comfortable 2-0 victory over relegation-threatened Luton Town
IMAGES from English Premier League matches played on Sunday.
IMAGES from the Premier League matches played on Saturday
Liverpool's English Premier League title winning captain Jordan Henderson was named England's Footballer of the Year on Friday in the annual vote of the Football Writers' Association (FWA).
IMAGES from the English Premier League matches played on Saturday
Manchester City now need, at most, 11 points from their remaining seven matches to secure their third Premier League title in four seasons.
Liverpool overcame another obstacle on the path to what looks an almost certain Premier League title triumph as they chalked up a record-breaking 20th win
Images from Saturday's action in the English Premier League.
With 27 wins and 82 points under their belt after only one defeat all season, red-hot Liverpool set a record-breaking pace to leave teams behind them in their wake and are six points shy of ending a 30-year wait for the top-flight title.
Real Madrid forward Vinicius Jr. score twice as his side punished a sloppy Liverpool to win 3-1, while Manchester City beat Borussia Dortmund 2-1 in Tuesday's Champions League quarter-final first leg.
Leaders Manchester City were held to a 0-0 draw at Crystal Palace
IMAGES from Premier League matches played on Sunday.
The Reds have won 28 of their 31 Premier League matches this season.
James Rodriguez scored one goal and set up two more as Colombia thoroughly dismantled Panama in a 5-0 win at the State Farm Stadium in Glendale, Arizona, on Saturday to march into the Copa America semi-finals.
Liverpool, five-times European champions and last season's Champions League runners-up, eased past the Bavarians and into the quarter-finals with two goals from Sadio Mane and one from Virgil van Dijk after a goalless first leg at Anfield.
The reigning champions have won 53 and drawn 11 of those 64 games, scoring 169 goals and conceding 42 for a total of 170 points.
Liverpool manager Juergen Klopp took exception to Frank Lampard's comments after the Chelsea boss labelled the Premier League champions 'arrogant' following a touchline spat during Wednesday's 5-3 win at Anfield. At his news conference ahead of Sunday's trip to Newcastle United for their final game of the season, Klopp said Lampard had a lot to learn to keep his emotions in check after the fulltime whistle.
Manchester United's Premier League match against Liverpool was postponed on Sunday after United fans forced their way into the stadium and stormed the Old Trafford pitch to protest against the club's owners - the Glazer family.
Leipzig will likely need to find an alternate venue or shift the two-leg tie around and first play in England.
Regardless of whether they eventually win it at home or away, the celebrations that marked their Anfield victory over Queens Park Rangers that won the league in 1990 will not be repeated.