PRESIDENTIAL RACE-DEMOCRATIC DEBATE

The surprise rivalry between front-runner Hillary Rodham Clinton and insurgent Bernie Sanders will be at the forefront as Democrats take the stage Tuesday in Las Vegas for the party's first debate of the 2016 presidential campaign. The Vermont independent senator and the former secretary of state will be joined by a trio of candidates who occupy the basement of early polls, each looking to change their fortunes with a breakout moment in prime time.

CLINTON EMAILS

WASHINGTON — The private email server running in Hillary Rodham Clinton's home basement when she was secretary of state was connected to the Internet in ways that made it more vulnerable to hackers, according to data and documents reviewed by The Associated Press. 

UNITED STATES-SYRIA

WASHINGTON — U.S. cargo planes dropped small arms ammunition to Arab groups fighting the Islamic State group in northern Syria, a U.S. military spokesman says.

HONDURAS-US-MONEY LAUNDERING

TEGUCIGALPA, Honduras — A Honduran bank caught up in a U.S. money laundering investigation will remain closed until Wednesday and will eventually be liquidated, government officials say. 

CANADA-EGYPT-AL-JAZEERA JOURNALIST

Mohamed Fahmy, a former Al-Jazeera journalist who was released from prison in Egypt last month, has returned home to Canada with the hope of starting an election debate on how the Canadian government can better protects its citizens abroad.

TEXAS ZOO-GUNS

DALLAS — Visitors to the Houston Zoo can now pack a little something extra besides a camera and picnic basket. The nearly century-old institution recently lifted its longtime firearms ban amid a broader push by gun-rights advocates who are pressuring zoos in Texas and elsewhere to do the same. 

PUERTO RICO-SCHOOL UNIFORM

SAN JUAN, Puerto Rico — Students at public schools across Puerto Rico for the first time can choose to wear pants or skirts as part of their uniform regardless of their gender without being punished, a move that has unleashed a debate in this socially conservative island. 

ARKANSAS EXECUTIONS

LITTLE ROCK, Arkansas — Arkansas is ordered to release information about its supplier of lethal injection drugs to attorneys for death row inmates who are challenging the state's execution secrecy law. 

DISSOLVING HEART STENTS

Now you see it, now you don't. A new type of heart stent that works like dissolving stitches, slowly going away after it has done its job, passed its first major test in a large study, doctors say.