A suspect has not been arrested for the April 15 Boston Marathon attack, CNN reported April 17.

Authorities have identified a possible suspect in the Boston Marathon bombing, The Boston Globe reported April 17.

U.S. Sen. Carl Levin of Michigan says he received a suspicious letter at the Saginaw regional office, according to a message Bloomberg News posted on Twitter on April 17.

U.S. Capitol Police have evacuated the first and third floors of the Hart Senate Office Building after the discovery of suspicious packages, WTKR News and Reuters reported April 17.

A letter addressed to U.S. President Barack Obama reportedly tested positive for ricin in a preliminary screening, a Secret Service official said April 17, NBC News reported.

Venezuelan National Assembly President Diosdado Cabello has dismissed four opposition lawmakers from their positions as presidents of legislative commissions, Ultimas Noticias reported April 17.

Venezuelan National Assembly President Diosdado Cabello announced on his Twitter account that he plans to ask the National Assembly to launch a penal investigation into defeated presidential candidate Henrique Capriles Radonski, El Nacional reported April 17.

A U.S. unmanned aerial vehicle on April 17 fired two missiles at a Taliban training camp in the Baber Ghar area of Pakistan's South Waziristan tribal district, killing at least five people, local officials said, Al Jazeera reported.