“There can be no place in our societies for the vile ideology that drives and incites hatred and fear. Together we will defeat those who seek to destroy our values, our way of life and seek to divide us,” she said.
UK police have stepped up patrols around mosques following the attack in New Zealand.
Officers were deployed to provide reassurance and advice on protective security as Muslims attended Friday prayers around the country.
Mr Javid is to hold talks with anti-terrorism chiefs and security officials to discuss possible further measures to protect mosques in the UK
National policing lead for counter-terrorism Assistant Commissioner Neil Basu said: “Whilst there is no intelligence linking these appalling events in Christchurch to the UK, additional uniform patrols will continue in London and nationally over the coming days, focusing on places of worship and specific communities. We are paying specific attention to Mosques, particularly Friday prayers.”
Facebook New Zealand’s director of policy Mia Garlick said in a statement: “Our hearts go out to the victims, their families and the community affected by this horrendous act.
“New Zealand Police alerted us to a video on Facebook shortly after the livestream commenced and we quickly removed both the shooter’s Facebook and Instagram accounts and the video.
“We’re also removing any praise or support for the crime and the shooter or shooters as soon as we’re aware.
“We will continue working directly with New Zealand Police as their response and investigation continues.”
YouTube said on Twitter: “Our hearts are broken over today’s terrible tragedy in New Zealand.
“Please know we are working vigilantly to remove any violent footage.”
A Twitter spokeswoman said: “We are deeply saddened by the shootings in Christchurch today.
“Twitter has rigorous processes and a dedicated team in place for managing exigent and emergency situations such as this.
“We also co-operate with law enforcement to facilitate their investigations as required.”