"We are not aware of any current, credible or active threat domestically, nor of any current information regarding obvious ties between the perpetrators in New Zealand and anyone in the United States," the statement said.
Earlier on Friday, mass shootings at two mosques in Christchurch, New Zealand, left at least 49 people dead and dozens more injured.
Nielsen said that the US Department of Homeland Security is aware of fears of many Muslims in the United States, especially those gathering for Friday prayers.
After the attacks in Christchurch Andrew Cuomo, New York Governor announced that state police will increase its patrols near mosques and houses of worship.
After the shootings New Zealand officials have detained four individuals, including a man charged with murder. None of the detainees previously appeared on terrorist watch lists, officials said.