In a rare show of support, Hungary's populist Prime Minister Viktor Orban urged Hungarians on Friday to pray that German Chancellor Angela Merkel wins this weekend's election despite the pair's clashes over refugees.

The world's nuclear arsenals are comprised mainly of two types of warheads -- atomic bombs, also called A-bombs, and the more powerful hydrogen or H-bombs.

Clashes between Sudanese forces and residents of a Darfur camp for the displaced killed three people Friday, the U.N. said, as President Omar al-Bashir urged reconciliation in the war-torn region.

China warned on Friday that the situation on the Korean Peninsula was "complicated and sensitive" and called for restraint on all sides after North Korea hinted that it might explode a hydrogen bomb over the Pacific Ocean.

Beijing's appeal came as a war of words between Donald Trump and Kim Jong-Un escalated, with the young North Korean leader calling the 71-year-old American president a "mentally deranged U.S. dotard."

U.S. President Donald Trump on Friday warned "madman" North Korean leader Kim Jong-Un that he would be "tested," the latest in an exchange of insults between the two.

"Kim Jong Un of North Korea, who is obviously a madman who doesn't mind starving or killing his people, will be tested like never before!" Trump tweeted.

Spain's conservative government has dealt a serious blow to Catalonia's plans to hold an independence referendum but it faces growing indignation in the region, which is closing ranks on Madrid.

German Chancellor Angela Merkel and her beleaguered rival Martin Schulz embark on a final push for votes Friday ahead of a weekend election, both seeking to beat back a challenge from the emboldened hard-right.

Russia is "deeply concerned" by the escalation of tensions over North Korea, the Kremlin said on Friday, after US President Donald Trump and North Korean leader Kim Jong-Un exchanged stinging barbs.

Spanish police have arrested a Moroccan man suspected of cooperating with a cell behind attacks that killed 16 people in Barcelona and another seaside resort last month, the interior ministry said Friday.

Four people drowned and up to 20 were missing on Friday after a fishing boat carrying migrants sunk off Turkey's Black Sea coast, reports said.