A 22-year-old man has been arrested after making bomb threats on Twitter ahead of Thursday's League One playoff fixture between Portsmouth and Sunderland.
Hampshire Police released a statement on Thursday morning which said the man from Northallerton, North Yorkshire, was arrested in the early hours of Thursday morning and that he remains in custody.
The statement added: "We continue to work with Portsmouth FC and can assure the public that a sufficient policing response will be in place for tonight's match."
The tweets in question have been deleted and the account has been suspended.
Portsmouth confirmed that special measures would be taken to ensure fans' safety during the second leg of the playoff semifinal on Thursday evening.
"The club would like to reassure fans that there will be enhanced security checks in place," a statement read.
The club also advised supporters to arrive early in order to gain entry into the ground in plenty of time. The match is scheduled to kick off at 7:45 p.m.