Worldwide, some of the most important events that occurred in January 2015 were the terrorist attacks on Charlie Hebdo in Paris, Boko Haram's deadly assault in Baga, Nigeria, and the death of Argentina's federal prosecutor Alberto Nisman. Some important events that occurred in January 2015 in the United States included New York City police officers turning their backs on Mayor Bill De Blasio and the jury selection for the Boston Marathon Bombing trial.
On January 7, 2015, two masked gunmen stormed the office of Charlie Hebdo, a satirical weekly magazine, in Paris, killing 12 people and critically injuring five others. The attack was said to be religiously motivated.
On January 8, 2015, Boko Haram took over Baga, Nigeria, burning the city to the ground and killing hundreds of citizens, making it one of the most deadly assaults by Boko Haram. On January 19, federal prosecutor Alberto Nisman of Argentina was found dead at his Buenos Aires home with a handgun nearby, just hours before he was scheduled to appear before Congress to discuss allegations that the Argentine President and other politicians covered up for Iranian suspects in a 1994 car bombing.
On January 4, 2015, thousands of New York City police officers turned their backs on Mayor Bill de Blasio while he delivered a eulogy for slain Officer Wenjian Liu, who was shot and killed along with his partner, Rafael Ramos, while on duty in Brooklyn, New York. Around this time, there was high tension between Mayor de Blasio and New York City police unions.
On January 5, 2015, the jury selection began for Dzhokhar Tsarnaev's trial in Boston, Massachusetts. Tsarnaev was charged with the 2013 Boston Marathon bombing that killed three people and wounded more than 260.