Nigeria's secret police have arrested and charged 45 suspects over an alleged Boko Haram plot to attack the country's financial hub, Lagos, sources with knowledge of the matter told AFP on Sunday.

"About 60 suspects were picked up from different locations in Lagos by the Department of State Services acting on intelligence information they were planning to attack Dolphin Estate in Ikoyi last month," said one source, referring to an upscale area of Lagos.

Direct flights between Ukraine and Russia were grounded Sunday as mistrust between the ex-Soviet neighbors boiled over into a new trade war that affects tens of thousands of families.

"I never thought it would come to this," said 30-year-old Muscovite Alexander Mikhaylin after walking off the very last Russian flight into Kiev's Boryspil airport late Saturday.

The European Union will "start falling apart" if it fails to take concrete action to tackle the migrant crisis within the next few weeks, Slovenian Prime Minister Miro Cerar warned Sunday.

"If we do not deliver some immediate and concrete actions on the ground in the next few days and weeks I believe the EU and Europe as a whole will start falling apart," said Cerar, whose tiny country of two million has been swamped by more than 60,000 migrants in a matter of days.

Colombians went to the polls Sunday to elect provincial governors and hundreds of local officials who will have a crucial role in implementing any peace agreement reached with leftist FARC rebels.

No incidents were reported as polls opened around the country at 8:00 am (1300 GMT) amid heavy security. They close at 4:00 pm (2100 GMT).

The world would be a better place if dictators such as Saddam Hussein and Moammar Gadhafi were still in power, top Republican U.S. presidential hopeful Donald Trump said in comments aired Sunday.

The billionaire real estate tycoon also told CNN's "State of the Union" talk show that the Middle East "blew up" around U.S. President Barack Obama and former secretary of state Hillary Clinton, his biggest Democratic rival in the race for the White House. 

A week ahead of Turkey's second election in five months, President Recep Tayyip Erdogan's party is working overtime to try to reclaim its parliamentary majority, in a climate of tension fueled by the Ankara attacks and the reignited Kurdish conflict.

Prime Minister Ahmet Davutoglu, leader of the dominant Justice and Development Party (AKP), is holding a mass campaign rally in Istanbul on Sunday, hoping to drum up enough support to defy the opinion polls that predict a replay of the June vote.

Ivory Coast voted in a presidential election Sunday expected to return incumbent Alassane Ouattara to power amid hopes of cementing peace after years of violence and upheaval.

More than six million people are eligible to cast ballots but concern is high that the violence sparked by the last election in 2010 will this time render a low voter turnout.

Twelve people were killed and dozens injured early Sunday after a fire broke out in a crowded karaoke bar in a city on Indonesia's Sulawesi island, police said.

The blaze was sparked by an electrical short-circuit on the second floor of the three-storey Inul Vizta club in the North Sulawesi provincial capital of Manado after midnight.

Maldives President Abdulla Yameen on Sunday described his deputy as a threat to national security after his arrest over an alleged attempt to assassinate Yameen in a speedboat bombing last month.

Soldiers and police patrolled the capital Male's streets in stepped up security, one day after vice president Ahmed Adeeb was arrested as he arrived back in the honeymoon islands from an official trip abroad.

Western-backed Ukrainian President Petro Poroshenko's fragile ruling coalition faced a major survival test Sunday in local elections that were instantly marred as voting was canceled in the strategic port of Mariupol.

Polling stations opened across all Kiev-administered regions accept for Mariupol -- a southeastern city of nearly 500,000 that provides a land bridge between pro-Moscow rebel regions and Ukraine's Russian-annexed Crimea peninsula.