Ukip put the response to the Manchester terrorist atrocity at the centre of its General Election manifesto launch, promising measures to cut down on immigration and tighten security.
Party leader Paul Nuttall called Islamic fundamentalism "one of the major issues" facing politicians in the coming years and said it was "not the British way to turn a blind eye to this evil in our midst".
The launch marked Ukip's return to campaigning for the June 8 poll following the Manchester Arena suicide bombing on Monday night.
Other parties resumed local campaigns following the minute's silence to mark the tragedy, but major national events will not restart until Friday.
Prime Minister Theresa May chaired a meeting of the Cobra emergency committee on the Manchester attack before flying to Brussels for a Nato summit, while Labour leader Jeremy Corbyn observed the minute's silence alongside firefighters in his constituency in Islington, north London.
In a sign that Ukip believes there is a political advantage to be found in taking a tough stance over the Manchester attack, the party's deputy chairwoman, Suzanne Evans, tore into Mrs May's record on tackling terrorism and said she "must bear some responsibility" for the bombing which killed 22.
"Theresa May might like to portray herself as a strong and stable leader who can tackle extremism, but her record suggests otherwise," said Ms Evans.
"Theresa May has allowed jihadists who fought alongside Islamic State back into our country.
"She has failed to prevent extremists spreading hatred in our universities and our mosques."
Mr Nuttall insisted he was "absolutely not" blaming the Prime Minister for the attack but she had an "appalling" record during her time as home secretary.
Ukip's policy pitch pledged to fund 20,000 extra troops and police officers, as well as 7,000 extra prison officers.
It restated the previously announced plan to ban face coverings such as the burka and impose a "one in, one out" system to curb net migration to zero.
The party also promised:
:: An extra £11 billion a year for the NHS and social care by the end of the next parliament, funded by cuts in foreign aid;
:: Not to raise taxes;
:: To scrap VAT on takeaways;
:: To abolish the House of Lords.
The party has seen its poll ratings suffer since Brexit and took a hammering at the local elections earlier this month in a sign that voters may consider its stance on the European Union to be less relevant since the referendum.
But writing in his foreword to the manifesto, Mr Nuttall said: "We are the country's insurance policy, the guard dogs of Brexit. We have fought for Brexit all our political lives and we want to ensure that the people get the kind of Brexit they voted for on June 23 last year."
Responding to the Ukip attacks on Mrs May, Home Secretary Amber Rudd said it was "not the time to make political points".
She said: "I think it's entirely the wrong approach. What we're trying to do now is support police, the intelligence services and of course the victims.
"We need to make sure they're getting all the help they need; this is not the time to make political points."