NYC Mayor Bill de Blasio. Photo: Drew Angerer / Getty Images

A former New York City school teacher and his twin brother were arrested and charged on Thursday after FBI and NYPD officers found bomb-making materials at their apartment, according to officials, who said they attempted to make an explosive device.

Law enforcement officials said at a press conference late Thursday that the probe is in its early stage. Mayor Bill de Blasio said there’s no “imminent threat” to the city.

What we know, per officials:

  • The brothers are 28-year old Christian and Tyler Toro.
  • Christian taught at a charter school in Manhattan and resigned last month after a bomb threat complaint was made last December at the school. Officials said the threat triggered a wider investigation and interview with students.
  • When Tyler returned his brother’s school-assigned laptop, a review by the school found a document with bomb-making instructions on the device.
  • After additional investigation, authorities got a search warrant. During the search at the brothers' apartment in The Bronx Thursday, 30 pounds of explosive chemicals were found. The men where taken into custody. Two students were also at the apartment at the time, officials said.
  • Neither individual was on the radar nor do they have criminal history prior to the beginning of last year's probe, officials said.

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