Sources: Several who went to Pakistan with Zazi back in U.S.

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Sources: Several who went to Pakistan with Zazi back in U.S. - CNN.com

(CNN) -- Several people who traveled from New York to Pakistan last year with a man accused of plotting a terrorist attack have since returned to the United States, sources close to the investigation told CNN.


Terror suspect Najibullah Zazi, seen here September 17, is accused of plotting to bomb a New York target.

A grand jury has been in session in New York in the last week as further charges are considered in the expanding terror investigation, CNN learned.

Najibullah Zazi, 24, appeared in federal court last week. He pleaded not guilty to charges of conspiring with others to detonate explosives in the United States.

Prosecutors allege that on August 28, 2008, Zazi and others flew to Peshawar, Pakistan, a city with a strong Taliban and al Qaeda presence.

Those currently under surveillance in the United States include members of Zazi's travel group, according to one source familiar with the investigation. Another source said at least some of the travel group are back in the United States. Officials will not discuss the identity, number or location of those under surveillance.