A woman who gave birth under arrest and her boyfriend were facing weapons charges Monday after authorities said they found a substance used to make bombs and papers titled "The Terrorist Encyclopedia" in their apartment in a picturesque Manhattan neighborhood.

Morgan Gliedman, the 27-year-old daughter of a prominent New York City physician, and Aaron Greene, 31, were arrested Saturday after officers with a search warrant discovered a plastic container with 7 grams of HMTD, a highly explosive white powder used in bomb making, police and prosecutors said.

Police Commissioner Raymond Kelly said Monday the substance was powerful, but it was difficult to speculate how much damage it would do in that amount.

Also found in the living room were written items with instructions on the manufacture of explosive materials and bombs, including a collection of pages that had a cover page titled "The Terrorist Encyclopedia" and a booklet titled "Deadly Homemade Weapons," court papers said. No political writings were discovered, and Kelly said the investigation was continuing into whether the couple had any larger plans or ties to any radical groups. They didn't show up on any watch lists.

Investigators also recovered a sawed-off shotgun, a commercial replica of a grenade launcher and ammunition and chemical precursors to HMTD found in the living room, according to police and court papers.

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Greene was held without bail after he appeared in state court in Manhattan on Sunday. Gliedman, nine months pregnant when arrested, went into labor and gave birth to a baby girl named Melanie, police said. She was hospitalized and had not yet appeared in court. It was not clear who will represent her. A call to her family was not returned yesterday.

Authorities said both defendants had drug problems.