U.S. intelligence officials say there was no immediate evidence the Boeing 737 was shot down.

U.S. Border Patrol agent Brian Terry was shot dead in 2010 in a case that exposed a botched federal gun program.

Fotis Dulos, 52, of Farmington, Conn., is arraigned along with two other people authorities say helped him cover up the killing of Jennifer Dulos.

Police said the suspect remains at large.

Researchers are crediting advances in lung-tumor treatments.