U.S. authorities have warned troops to avoid drawing attention to their military ties on their social media accounts, ABC news reported Monday.

The FBI and the Department of Homeland Security want current and former military members to check accounts for information that might attract the attention of the Islamic State group and its supporters, a bulletin to law enforcement agencies said.

A major U.S. air force base in South Korea went into full lockdown for more than an hour Monday after what appeared to be a false alarm about a shooter at the facility's high school.

"The security forces sweeps are now complete. There were no reported injuries or suspicious activity found," the 51st Fighter Wing stationed at Osan Air Base said in a post on its official Facebook page.

A wave of U.S.-led air strikes have struck at least 30 targets around the Syrian city of Raqa, the self-proclaimed capital of the Islamic State group, a monitor said Sunday.

The Syrian Observatory for Human Rights said the strikes took place before midnight Saturday and hit 30 targets on the northern outskirts of Raqa.

Nearly deaf and riddled with cancer and ulcers, 90-year-old Rampyari Bai insists she will never give up fighting for justice for victims of the world's worst industrial disaster.

"I will fight until my very last breath, even if I have to crawl on the ground," says Bai at her home in Bhopal, the site of a catastrophic leak at a chemical plant on December 2, 1984.

A Qatari appeals court acquitted Sunday a U.S. couple charged with parental neglect leading to their daughter's death by suspected starvation, ending a nearly two-year legal ordeal for the Americans.

Matthew and Grace Huang were arrested in January 2013 after the death of their eight-year-old daughter Gloria, who had been adopted from an orphanage in Ghana.

A U.S. boy whose mother reported him missing four years ago was found by police hidden behind a false wall in his father's Georgia home, local media said Saturday.

Authorities arrested five people including the father, in Jonesboro, near Atlanta.

Condemned at the U.N. for rights abuses, North Korea hit back Friday, describing the United States as a human rights "tundra" where racial discrimination flourishes.

Citing the protests that erupted when a police officer was not charged in the shooting death of an unarmed black teenager in Ferguson, Missouri, a foreign ministry spokesman heaped scorn on the notion of "rule of law" in the U.S.

Iraqi forces held off a jihadist assault on the government headquarters in the capital of Anbar province, deploying reinforcements in the key battleground against the Islamic State group, officers said Thursday.

Security forces, backed by tribesmen, managed to defend the complex in Ramadi, which lies 100 kilometers (60 miles) west of the Iraqi capital and is one of the last major urban areas in Anbar under Baghdad's control.

U.S. police officers shot dead a 12-year-old black boy carrying a replica gun within seconds of their patrol car arriving on the scene, a surveillance video released Wednesday showed.

The sudden end to the incident has stoked anger at police tactics in the United States, in the wake of rioting triggered by a decision not to prosecute a white officer who killed an unarmed black teenager.

The leaders of the United States and Mexico spoke Wednesday to discuss President Barack Obama's executive actions to overhaul aspects of America's immigration system.

Obama and Mexican President Enrique Pena Nieto said they wanted their countries to "work together in Central America to help address the underlying factors driving migration from the region to Mexico and the United States and deter migrant smuggling, including the smuggling of unaccompanied children," the White House said in a statement.