Federal agents have detonated a "potentially volatile substance" behind a Houston home where the FBI on Friday conducted a search.

FBI spokeswoman Shauna Dunlap says no one has been arrested but the controlled detonation Saturday afternoon was intended for the safety of the public and authorities at the scene. She would not elaborate on the nature of the material blown up. The home is one of two in Houston and a condominium in Bryan, about 100 miles to the northwest, searched under court-ordered sealed warrants.

Records show the properties are owned by a Houston art expert and her husband.  Local reports indicate a business associate of the couple has said their 22-year-old son is the focus of the FBI activity.