Kent Police are making inquiries into a report of electoral fraud in the Thanet South seat, contested in the general election by Ukip leader Nigel Farage.
Days before the election, Farage had a healthy nine-point poll lead in the seat, with it looking like a foregone conclusion that he would win it.
Instead, Mr Farage finished second with 16,026 votes, with the Conservative Party's Craig Mackinlay taking the seat with 18,838 votes.
A spokeswoman for Kent Police said "inquires were ongoing" and the force could not say any more at this stage.
The result was not declared at the count at Margate's Winter Gardens until about 10.35 GMT on Friday, hours later than expected.
Mr Farage announced his resignation after failing to become an MP but this was rejected by his party and he continues to be UKIP leader.
There were council elections held in most parts of England on the same day and in those elections Ukip won by a landslide in the election for Thanet District Council.
There are 56 councillors in total and this is how many each party now has: 33 UKIP Councillors; 18 Conservative Councillors; 4 Labour Councillors; 1 Independent Councillor.
It seems an anomaly that Ukip won the Thanet council election in a landslide but were narrowly defeated in Thanet South in the General Election.
Fraud probe in Nigel Farage-contested Thanet South seat
BBC News
13 May 2015
Nigel Farage (left), comedian Al Murray (centre) and Craig Mackinlay (right) all contested the South Thanet seat
Kent Police are making inquiries into a report of electoral fraud in the Thanet South seat, contested in the general election by Nigel Farage.
The UKIP leader failed to win the seat, losing out to Conservative candidate Craig Mackinlay.
Mr Farage secured 16,026 votes, with Mr Mackinlay achieving 18,838.
A spokeswoman for Kent Police said "inquires were ongoing" and the force could not say any more at this stage.
'Postal vote problems'
The result was not declared at the count at Margate's Winter Gardens until about 10.35 GMT on Friday, hours later than expected.
BBC reporters were told by officials at the time the delays were caused by the sheer volume of ballot papers and problems verifying the postal vote.
Turnout was 69%, up from 65% in 2010.
Claims of suspicious behaviour appeared on social media following the delays.
Labour's South Thanet candidate Will Scobie, who received 11,740 votes, said he thought the count took a long time because they were "trying to do two constituencies at once".
"If police are investigating we'll have to wait and see what the outcome is," he added.
The Thanet South seat was also contested by Ian Driver of the Green Party, who got 1,076 votes, and Liberal Democrat Russell Timpson who secured 932 votes.
Both Mr Driver and Mr Timpson lost their deposits after failing to secure 5% of the vote.
Comedian Al Murray, who stood for election in the guise of The Pub Landlord for the Free United Kingdom Party, came in sixth place with 318 votes.
Mr Farage announced his resignation after failing to become an MP but this was rejected by his party and he continues to be UKIP leader.
Fraud probe in Nigel Farage-contested Thanet South seat - BBC News
Days before the election, Farage had a healthy nine-point poll lead in the seat, with it looking like a foregone conclusion that he would win it.
Instead, Mr Farage finished second with 16,026 votes, with the Conservative Party's Craig Mackinlay taking the seat with 18,838 votes.
A spokeswoman for Kent Police said "inquires were ongoing" and the force could not say any more at this stage.
The result was not declared at the count at Margate's Winter Gardens until about 10.35 GMT on Friday, hours later than expected.
Mr Farage announced his resignation after failing to become an MP but this was rejected by his party and he continues to be UKIP leader.
There were council elections held in most parts of England on the same day and in those elections Ukip won by a landslide in the election for Thanet District Council.
There are 56 councillors in total and this is how many each party now has: 33 UKIP Councillors; 18 Conservative Councillors; 4 Labour Councillors; 1 Independent Councillor.
It seems an anomaly that Ukip won the Thanet council election in a landslide but were narrowly defeated in Thanet South in the General Election.
Fraud probe in Nigel Farage-contested Thanet South seat
BBC News
13 May 2015
Nigel Farage (left), comedian Al Murray (centre) and Craig Mackinlay (right) all contested the South Thanet seat
Kent Police are making inquiries into a report of electoral fraud in the Thanet South seat, contested in the general election by Nigel Farage.
The UKIP leader failed to win the seat, losing out to Conservative candidate Craig Mackinlay.
Mr Farage secured 16,026 votes, with Mr Mackinlay achieving 18,838.
A spokeswoman for Kent Police said "inquires were ongoing" and the force could not say any more at this stage.
'Postal vote problems'
The result was not declared at the count at Margate's Winter Gardens until about 10.35 GMT on Friday, hours later than expected.
BBC reporters were told by officials at the time the delays were caused by the sheer volume of ballot papers and problems verifying the postal vote.
Turnout was 69%, up from 65% in 2010.
Claims of suspicious behaviour appeared on social media following the delays.
Labour's South Thanet candidate Will Scobie, who received 11,740 votes, said he thought the count took a long time because they were "trying to do two constituencies at once".
"If police are investigating we'll have to wait and see what the outcome is," he added.
The Thanet South seat was also contested by Ian Driver of the Green Party, who got 1,076 votes, and Liberal Democrat Russell Timpson who secured 932 votes.
Both Mr Driver and Mr Timpson lost their deposits after failing to secure 5% of the vote.
Comedian Al Murray, who stood for election in the guise of The Pub Landlord for the Free United Kingdom Party, came in sixth place with 318 votes.
Mr Farage announced his resignation after failing to become an MP but this was rejected by his party and he continues to be UKIP leader.
Fraud probe in Nigel Farage-contested Thanet South seat - BBC News