Noelle Velentzas, 28, and Asia Siddiqui, 31, both wore blue prison garb as their attorneys entered the pleas on their behalf to an indictment charging them each with a count of conspiring to use a weapon of mass destruction and teaching how to make such a devise. Siddiqui was also charged with lying to FBI agents.
An attorney for Siddiqui said he plans on fighting the charges. Velentzas, donning a hijab, smiled at supporters in the gallery as she was brought into the court. Those supporters declined to speak to reporters.
Velentzas in particular had been "obsessed" with the 2013 Boston Marathon bombings and even joked about the explosives, according to recorded conversations detailed in a complaint against the women.
Siddiqui had written jihadist poetry later published in a magazine called "Jihad Recollections" and had been in contact with the editor of al-Qaida in the Arabian Peninsula's "Inspire" magazine but lied to FBI agents about those connections, court documents show.
They were arrested after Siddiqui acquired propane tanks and instructions on how to turn them into bombs, a criminal complaint suggests.
Authorities said Velentzas, 27, was believed to have been born in Florida of Greek ethnicity. Siddiqui, 31, was born in Saudi Arabia. Both women are US citizens.
Prosecutors asked for two more weeks before the next court appearance, telling a magistrate judge that the case was complex and involved a vast amount of evidence, including recordings. They're scheduled to next appear before a judge on May 20.
