FBI agents searched five properties in Texas and Michigan owned by the same couple for a chemical that could be used to make deadly gas, officials say. Agents donned hazardous materials gear Friday to search two homes in Houston, the Houston Chronicle reported Sunday. Agents also executed a search warrant at a house in the central Texas town of Bryan. The homes are owned by Cecily Horton, an art consultant, and her husband, Andrew Schneck. The couple are reportedly not the subject of the search and no arrests were reported. About 60 agents were involved in the search of the Michigan home in Leelanau County, the sheriff\'s office said on its website. A law enforcement source who spoke off the record told the Chronicle the Houston-area searches were reportedly triggered by someone ordering chemicals that could be used to nerve gas or tear gas.