After eight years in Venezuela's National Guard, Lt. Juan Carlos Mora fled to Colombia last month, denounced President Nicolás Maduro and declared his support for Juan Guaidó, the opposition leader now recognized by the U.S. and about 50 other countries as the legitimate head of state.

Guaidó "is president and military commander," Mora said in an interview in Cúcuta, a Colombian city near the border with Venezuela. "He is now my boss."

A British petition to cancel Brexit and remain in the European Union is drawing too much support for the U.K. government's website to handle, with the petition site crashing repeatedly on Thursday. More than 1 million people have signed the petition to revoke the triggering of Article 50 — blowing past the 100,000 signatures needed to compel a debate in Parliament. Article 50 is the EU treaty's exit clause.

Thousands of people remain stranded in floodwaters in the wake of Cyclone Idai, which struck the coast of Mozambique and swept through Zimbabwe last week.

Mozambique's Land and Environment Minister Celso Correia told reporters that 15,000 people are still stranded. But as rescue workers struggle to gain access to regions largely choked off by the flooding, the death toll is expected to rise sharply.

Precision medicine promises to tailor the diagnosis and treatment of disease to your unique genetic makeup. A doctor may use the presence of certain genetic markers to diagnose a disease, or choose one drug for treatment over another.

Updated at 6:52 p.m. ET

An amusement park boat has sunk in Iraq's Tigris River, killing at least 100 people, according to Iraqi state television. The passengers were celebrating Nowruz, a joyous holiday marking the new year at the start of spring.

Video footage showed people being carried away in the water's fast current as onlookers shout from a nearby theme park.

NPR's Jane Arraf reports that many of the dead were children. At least 55 people were rescued.

Acting Defense Secretary Patrick Shanahan is under investigation by the Pentagon's Office of Inspector General because of allegations he improperly advocated on behalf of his former employer, Boeing Co.

Nicaragua's government says it will release hundreds of opposition protesters who have been detained in the months since anti-government protests began nearly a year ago.

Mediators made the announcement Wednesday in Managua.

The government of President Daniel Ortega made the promise in order to restart talks with the opposition that had been stalled since security forces made more detentions over the weekend.

Take a look at a class roster at the University of Vermont. You'll see the usual stuff there — last name, student ID and class year. But you'll also see something else. Next to some names, there are pronouns: "he" or "she," but also the gender non-specific "they" or "ze."

They may seem like a few more words on paper, but for some students, like Jeane Robles, having pronouns on the roster means a lot.

Venezuelan opposition leader Juan Guaidó said Thursday that government agents detained his chief of staff, Roberto Marrero, in an overnight raid. Describing what he called a kidnapping, Guaidó said weapons had been planted at Marrero's house and that he should be freed immediately.

The raid took place around 2 a.m. local time, Guaidó said, adding that he does not know Marrero's current whereabouts — and saying his chief of staff had denounced any knowledge of two rifles and a grenade that he says authorities allegedly found in his home.