Mosques across New Zealand are "free and welcome to open their doors" but police will maintain an armed presence after 50 people were killed and over an equal number of people were injured in the gruesome Christchurch terror attack."Mosques are welcome to open their doors if they choose to do so. Police will continue to maintain a presence at all Mosques across New Zealand," New Zealand Police tweeted on Sunday.Mosques across the country were advised to shut down following the March 14 terror attack, which shook the global community.Meanwhile, security was beefed up outside mosques in United States, United Kingdom, Australia, Canada and other countries following the ghastly shootings, carried out by a 28-year-old white man Brenton Harrison Tarrant, who has been charged with murder ever since.Police believe that Tarrant single-handedly carried out the terror attack at both the mosques under a span of 36 minutes during the ongoing Friday prayers for which a large number of faithful had .