A Colorado man jailed since last week has been charged with conspiring to launch a bomb attack inside the United States. Twenty-four-year-old Najibullah Zazi is accused of acquiring and preparing explosive materials similar to those used in the 2005 London transit bombings. Prosecutors say Zazi bought chemicals from beauty supply stores and experimented with preparing deadly explosives. It’s unclear if authorities believe Zazi intended to attack a specific target. Zazi was initially arrested along with his father and a New York imam on allegations of lying to federal agents. On Thursday, both the father and the imam were freed on bail. The imam, Ahmad Wais Afzali, denied the allegations against him.

Ahmad Wais Afzali: “As imam, it’s against Islamic law to hurt anybody, period. I am very much against this myself, very much against this. And the last time I saw Zazi was God knows how many years ago. That’s about it.”