Federal investigators focused Tuesday on the possible involvement of the Pakistani Taliban in the failed Times Square bombing as they pieced together clues and charged a suspect who was pulled off an airplane as he headed to his native Pakistan, according to court documents and law enforcement sources.

Faisal Shahzad, a 30-year-old U.S. citizen arrested late Monday at John F. Kennedy International Airport, admitted his involvement in the plot, authorities said, and told FBI agents he received bombmaking training in a region of Pakistan known as a militant hotbed. Shahzad, who became a naturalized citizen last year, is from a military family in Pakistan, where he spent five months before returning in February to his home in a leafy, quiet neighborhood of Shelton, Conn.

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