Home Secretary Theresa May says efforts to stamp out anti-semitism in Britain must be "redoubled", after members of the Jewish community expressed concerns over their safety.
Speaking at an event to commemorate Jews that died during the terror attacks in France, May said: "I never thought I would see the day when members of the Jewish community in the United Kingdom would say they were fearful of remaining here in the United Kingdom."
She said the recent attack on a Jewish supermarket in Paris - which left four innocent people dead - was a "chilling reminder of anti-Semitism, not just in France but the recent anti-Semitic prejudice that we sadly have seen in this country".
After Scotland Yard assistant commissioner Mark Rowley spoke of a "heightened concern" among police about the threat to Jewish communities, May said she was aware that "many Jewish people in this country are feeling vulnerable and fearful".
The gunmen behind the deadly attack on French satirical magazine Charlie Hebdo have reportedly been buried in unmarked graves amid tight security.
Cherif Kouachi was buried overnight in his hometown of Gennevilliers near Paris, an official from the local mayor's office told AFP while his brother and accomplice Said Kouachi was buried late on Friday in Reims.
Both brothers have been buried in unmarked graves to prevent them from becoming shrines for Islamists.
The pair attacked Charlie Hebdo on January 7, killing 12 people. They were killed by police two days later during a standoff at an industrial estate north of Paris.
Copies of French newspaper Charlie Hebdo are in short supply after seven million were sold following the deaths of 10 of its journalists.
The front cover shows a cartoon of the Prophet Mohammed holding a Je Suis Charlie placard which has become a symbol for freedom of speech.
All copies sold out in France within minutes and some distributors in the UK have been unable to get copies due to such high demand.
The newspaper usually has a circulation of 60,000.
At least two churches have been torched in Niger as violent protests against the depiction of Mohammed in Charlie Hebdo continue.
Four people are known to have died during demonstrations in the country so far, while police fired tear gas at hundreds of people throwing rocks in the capital Niamey today.
At least two police cars were burned in a second day of protests - with Agence France-Presse also reporting that churches were targeted.
Peaceful marches took place in the capital cities of Mali, Senegal, Mauritania and Algeria, all of which are also former French colonies in Africa.
One protester in Niger told Reuters news agency: "They offended our Prophet Mohammed, that's what we didn't like."
A Jewish security charity said it has received an "unprecedented" number of calls from Jewish people fearing a Paris-style terrorist attack in the UK, as it welcomed news that the protection of the community will be strengthened.
The Community Security Trust (CST) said today's announcement from Britain's chief counter-terror police officer Mark Rowley was both "appropriate and necessary".
Scotland Yard assistant commissioner Mark Rowley, said there was a "heightened concern" about the risk to the Jewish population in the UK since the attacks and a security review would be carried out.
Mark Gardner, director of communications at CST, said Jewish neighbourhoods can expect to see increased levels of policing but said they have been told by police that there is no specific intelligence suggesting an imminent attack.
He added: "We have taken an unprecedented number of calls and emails from concerned members of our community from parents of school children to shop owners and all manner of organisations.
"We always ask our community to be alert but not alarmed and certainly not be in a state of panic."
The Association of Chief Police Officers has been reviewing its security measures following the devastating attacks in Paris last week.
Metropolitan Police assistant commissioner Mark Rowley, the national policing lead for counter-terrorism, said the attack on a kosher supermarket in the French capital and anti-semitic rhetoric from extremists has led to a "heightened concern" about the risk to the Jewish population in the UK.
Mr Rowley said: "The global picture of terrorist activity does give us heightened concern about the risk to the Jewish community in the UK. We are seeing continuing anti-Semitic rhetoric from extremists and attacks on this community in France and elsewhere.
"In addition to our existing security measures, we are in dialogue with Jewish Community leaders about further actions that we will be taking, including more patrols in key areas."
He added that the "deliberate targeting" of police in recent terrorist attacks has also raised fears about the dangers faced by frontline staff.
Chief constables across the country are reviewing how to strengthen the protection of their officers and the Jewish community in the light of the Paris terrorist attacks, senior counter terrorism officer and Metropolitan Police Assistant Commissioner Mark Rowley said.
Senior religious leaders from Christian, Jewish and Muslim traditions joined forces to present a united condemnation of last week's terror attacks in France.
An interfaith "unity gathering" was held at the Islamic Cultural Centre at Regents Park Mosque in London, with around 20 prominent religious figures attending after the attacks, which left 17 people dead.
Dr Shuja Shafi, secretary general of the Muslim Council of Britain, told ITV News the massacre had "hurt and moved" everyone, and said the event had been organised to show such violence had "no place" in any faith.
He urged British Muslims to react with dignity after hundreds of copies of satirical magazine Charlie Hebdo, featuring a weeping Prophet Mohammed on the front, went on sale in the UK this morning.
We're at risk of doing the very thing the terrorists want us to do - divide our society.
Today I understand the English version of a Prophet Mohammed is being published.
Yes Muslims are no doubt hurt and offended by those depictions. But nothing offends us more than the insult, hurt and dishonour this attack has brought on our community and faith.
A suspected gunman who allegedly took two people hostage inside a post office has been arrested, AFP news agency reported citing police.
Both hostages have also reportedly been freed.