A Ukip spokesman said that any breach of party rules would be investigated, but also criticised the exposure of candidate William Henwood's tweet by "the other parties."
A spokesman for the party told the BBC:
Any breach of our rules will be duly investigated and action will be taken.
However one has to question why the other parties are spending hours behaving like secret police and trawling through the social media of Ukip candidates who are everyday men and women, rather than actually doing politics.
Perhaps if they did they would be better able to tackle us on policy, rather than having to rely on smear campaigns to try to undermine Ukip's increasing popularity.
Were we to return the favour we would find an even greater wealth of embarrassment and disgrace in the other three parties' ranks to also spread across the media.
Ukip is facing a fresh backlash over comments made on Twitter by one of its candidates who suggested Lenny Henry should emigrate to a "black country" in response to a speech by the actor and comedian that said ethnic minorities were under-represented on British television.
William Henwood, who is standing in a council election, told the BBC: "I think if black people come to this country and don't like mixing with white people why are they here? If he (Henry) wants a lot of blacks around go and live in a black country."
An 11-year-old boy, who went missing from Enfield yesterday, has been found.
Nasco Chageedera disappeared around midday on Saturday after setting off towards the adventure playground on Fore Street.
A top student facing deportation has told Daybreak she is "really frightened" she will be forced to return to Mauritius, and fears her life will be in danger if she is forced to leave the UK.
Speaking from Yarl's Wood detention centre, Yashika Bageerathi, said Mauritius was "no longer the paradise island that it used to be".
Campaigners and fellow students of Yashika Bageertathi protested outside the Home Office in London on Sunday.
An A level student who fled her home in Mauritius after a family member threatened her with violence and sexual assault has spoken of her fears if she returns.
Yashika Bageerathi said the man in question, who deals drugs, had people waiting for her to arrive home and was angry because he had lost money.
My family will know where I am. He [the family member] is already after our lives, he says he has people waiting at the airport for us to come back.
He lost a lot of money because of us to do with his drug-dealing.
Supermodel Cara Delevigne has joined the flurry of support for a top A level student faced with deportation.
The Rt. Hon. Theresa May MP, Home Secretary: #FightForYashika Stop this sixth form student being deported alone. She deserves a future!
Yashika Bageerathi, 19, who is being held at Yarl's Wood detention centre, had her case reviewed separately from the rest of her family, as she is an adult in the eyes of the law.
Support for the high achieving student has gathered pace with the hashtag #FightForYashika and Labour MP David Hanson calling the decision to deport her "very unfair".
An online petition urging the Government to keep her in the UK has reached 15,000 signatures.
A 19-year-old A level student may be deported to Mauritius as early as Tuesday if the Home Office do not answer calls to review her case.
Yashika Bageerathi, who is predicted two A* and a B at A level, fled the island nation in 2012 after a family member threatened her with violence and sexual assault.
The "fantastic student" has flourished at Oasis Hadley Academy in Enfield, but was moved to Yarl's Wood detention centre in December last year.
A statement from the school said to the Guardian newspaper said: "To deport Yashika at any stage would cost the UK a valuable member of society.
"To do so just weeks before she is about to complete her education would be an uncompassionate and illogical act of absurdity."
RSPCA inspector Kate Ford said:
It is a bit of a strange one. On the one hand, Lola seems to have been cared for. She is in good condition, has a lovely temperament and seems used to people, and then there was the bag of treats left nearby – a nice little touch which makes you think she had been loved. It also almost feels like a nice garden was chosen on purpose for her to be abandoned in.
On the other hand, she was dumped, and apparently over a high wall, which was quite some drop. Thankfully initial stiffness in her rear legs seems ok now and a vet gave her a clean bill of health.
She is such a lovely dog with a really sweet nature. I hope there is a happy ending round the corner for her.
The RSPCA is appealing for information after a dog was dumped over a wall in Enfield.
The tan Staffordshire bull terrier was found in a garden in Cecil Road at around Midnight on Friday 14th March.
A plastic bag containing dog treats and a lead was found nearby.
The dog is thought to be around two years old and has been named Lola by the family who found her.
Her rear legs were extremely stiff at first and it is thought she had been dropped over the high garden wall.