Seven Islamist extremists were killed in a shootout in Pakistan's wealthy Punjab province as police raided the group suspected of launching attacks on security posts, officials said Sunday.

The United States must extradite Islamic preacher Fethullah Gulen to Turkey to remove any suspicion that Washington was involved in the failed July 15 coup, the mayor of Ankara Melih Gokcek said.

Gunmen locked in a lengthy stand-off with police in Armenia have released their last two hostages, an official said Sunday, after a fresh night of protests shook the capital Yerevan.

Donald Trump hit back Saturday at accusations from the father of a slain Muslim soldier that the billionaire has "sacrificed nothing" for his country, saying he had employed thousands of people.

Khizr Khan -- whose son died in Iraq -- accused the Republican presidential nominee of vilifying American Muslims in a steely rebuke that electrified the Democratic convention on Thursday.

Beijing has confirmed it is investigating a Japanese suspected of "endangering China's national security," following Japanese reports that he had been detained, the latest irritant in relations between the two nations.

Venezuela's attorney general requested Saturday to nullify the National Assembly's decision to reinstate three lawmakers accused of voting fraud.

The opposition-controlled National Assembly swore in three suspended lawmakers from the southern state Amazonas Thursday, which the attorney general's office said "has generated an absolutely unconstitutional and unlawful situation that cannot be recognized or supported by agencies and entities of public administration."

At least one person was killed and four others wounded in a shooting in Austin, Texas early Sunday, with police warning that the shooter was still at large.

The incident began shortly after 2:15am (0715 GMT) in a busy downtown area filled with bars and nightclubs, with police warning people on Twitter to steer clear of the area due to an "active shooter."

Six people were killed Sunday in a gun and car-bomb assault on a police building in the center of the Somali capital that also left seven assailants dead, Security Minister Abdirasak Omar Mohamed said.

Washington has warned that those who perpetrate atrocities in South Sudan's civil war will be held responsible for their crimes.

The United States served as a midwife in the creation of the South Sudan, formed in July 2011 by partitioning Sudan.

President Recep Tayyip Erdogan on Saturday said he wanted to introduce constitutional changes to bring the Turkish spy agency and military chief of staff directly under his control as he seeks to tighten his grip on the country after the failed coup.