Shocked and strongly condemn the Christchurch, New Zealand, terrorist attack on mosques.
Forty-one people were killed at the Al Noor mosque, seven at a mosque in the Linwood neighbourhood and one died in hospital, police said.
"Patrols will be held around religious sites", Castaner said on his official Twitter account.
New Zealand PM Jacinda Ardern on Friday said that shootings at the two mosques in Christchurch could 'only be described as a terrorist attack'.
- One of the suspected attackers - Brenton Tarrant - appears to have live-streamed the attack on Facebook.
France is home to the largest Muslim minority population in Western Europe and suffered deadly Islamist militant attacks in 2015 and 2016. "But I just ask people, don't share them".
Local media reported at least nine people were dead.
Christchurch remains in lockdown with the authorities urging anyone planning to visit a mosque in New Zealand to refrain from doing so.
"I am not going to let this change New Zealand's profile, none of us should".
49 killed in New Zealand mosque shooting
Three Bangladeshis were among the dead and one was missing, the consulate said.
Australian Prime Minister Scott Morrison said one of the men in custody was Australian.
"My thoughts and solidarity are with New Zealand's Muslim community and all of its people on this dark day".
He describes himself as "a private and mostly introverted person" and admits he is racist, adding that he is an "Eco-fascist by nature".
Four suspects - three men and a woman - were taken into custody and multiple explosive devices found attached to cars in the city.
Home to almost 400,000 people, Christchurch is the largest city on New Zealand's South Island. The gunman spends more than two minutes inside the mosque spraying terrified worshippers with bullets again and again, sometimes re-firing at people he has already cut down.
After going back outside and shooting a woman there, he gets back in his auto, where a song can be heard blasting.
The footage showed the killer was carrying a shotgun and two fully automatic military assault rifles, with an extra magazine taped to one of the weapons so that he could reload quickly. In a statement he said: "Our hearts go out to the people of New Zealand following the news of this bad act in Christchurch". He also had more assault weapons in the trunk of his vehicle, along with what appeared to be explosives.
He said he chose New Zealand because of its location, to show that even the most remote parts of the world were not free of "mass immigration". He said he was not a member of any organization, but had donated to and interacted with many nationalist groups, though he acted alone and no group ordered the attack. Ardern, whose party campaigned on a promise to take in more refugees, called it "the right thing to do".