The authorities have charged an 18-year-old accused of lighting an incendiary device and throwing it at a Planned Parenthood building in Delaware.

The teenager, Samuel James Gulick, of Middletown, Del., was charged on Monday with three counts: maliciously damaging a building used in interstate commerce through the use of fire or destructive device; intentionally damaging a facility that provides reproductive health services; and possession of an unregistered destructive device under the National Firearms Act, according to a news release from the United States Attorney’s Office for the District of Delaware.

About 2:16 a.m. on Friday, Mr. Gulick drove to a Planned Parenthood building in Newark, Del., according to court documents.

Video surveillance recorded Mr. Gulick standing on the porch of the building and spray-painting in red letters the Crusader slogan “Deus vult” (God wills it).