A MAN has been arrested over an online threat to kill Portsmouth fans in a bomb attack ahead of their play-off match with Sunderland tonight.  North Yorkshire police took a 22-year-old Northallerton man into custody in the early hours after social media threats relating to the fixture at Fratton Park, according to The Telegraph’s Gareth Davies.  Tweets posted by @Kieran30971361 referred to the Manchester Bombing and killing 150 Portsmouth fans.  The Twitter user wrote: “I wounder how many Portsmouth fans I can shoot everyone remember the Manchester arena bombing just imagine fratton park going bang well let’s find out tomorrow.”  Followed by: “Bomb bomb fratton park went bang the Portsmouth fans all died Haha going to be fun tomorrow headline news.”  The account has since been suspended, with Pompey due to carry out extra security checks at Fratton Park before the League One semi-final second leg.  A club statement read: “The club would like to reassure fans that there will be enhanced security checks in place for Thursday’s play-off match against Sunderland at Fratton Park.  “Due to these checks, all supporters with tickets are advised to arrive in plenty of time to make sure they are inside the stadium for the start of the game.”  Sunderland take a 1-0 lead into the clash, which has seen further threats. Most read in footballMAGIC LAMP Frank Lampard ‘to be named new Chelsea boss with Sarri on brink of sack’ ban city Man City face Champions League ban after being found guilty of breaking FFP rules VideoDEVASTATED Ex-Wigan star Figueroa breaks down in tears on pitch after hearing dad had died Live BlogBLUES NEWS Chelsea transfer news LIVE – Latest updates from Stamford Bridge HOLY TRAIL Paul Pogba and Kurt Zouma mark Ramadan with annual trip to Mecca DIRTY MONEY Promoted Sheffield Utd ‘bankrolled with £3m loan by Osama bin Laden’s family’ Live BlogUNited news Man Utd transfer news LIVE – follow latest updates from Old Trafford TEAR WE GO Frank Lampard mocks Leeds song ‘stop crying Frank Lampard’ in dressing room joy ExclusiveWAN VAN UNITED Man United eye double swoop for Palace stars Wan-Bissaka and Van Aanholt GossipSALAH-VATING Real Madrid ‘make initial contact with Salah’ as star tops Zidane’s wishlist  Another account @CookiePFC_ tweeted: “20 quid to anyone who can hit a family of Sunderland fans in the away end with a smoke bomb Thursday”.  Hampshire Constabulary added: “We are aware of threats made on social media regarding the football match between Sunderland and Portsmouth taking place in Portsmouth tomorrow.  “We are looking into these posts and want to assure the public that a sufficient policing response will be in place for the match tomorrow and that we are working alongside Portsmouth FC.” Portsmouth vs Sunderland – How to watch, live stream, kick-off times for the League One play-off semi-final