Here's what you need to know about last week.
1. U.S. presidential election
Texas Sen. Ted Cruz and Ohio Gov. John Kasich teamed up to prevent business mogul and presidential hopeful Donald Trump from getting the support of 1,237 delegates he needs to clinch the Republican Party nomination. The two candidates will not compete against each other in key states. Trump said the cooperation was "pathetic," and won all five states in Tuesday's primary elections.
Former Secretary of State Hillary Clinton won four out of five states, shaking the campaign of her Democratic rival, Vermont Sen. Bernie Sanders.
2. Iraqi chaos
Baghdad declared a state of emergency after hundreds of protesters of Shia cleric Muqtada al-Sadr stormed the capital's Green Zone, chanting "the cowards ran way," referring to Iraqi MPs who failed to convene for a vote on ministerial changes. This has been considered a major escalation of the country's enduring political crisis.
On a separate note, at least 14 Shiite pilgrims near Baghdad were killed and 25 were injured in a car explosion Saturday, security and medical officials said.
3. Syria airstrikes
Violence in Syria intensified as an airstrike from an unidentified fighter jet hit a hospital in northern Syria Wednesday, April 27, killing at least 27 people, including three children and three doctors, one of them was the city's last pediatrician, a human rights group said.
Violence in the city of Aleppo ended a fragile truce days after a halt in peace talks and the deployment of Russian artillery in Syria.
4. Norway helicopter crash
All commercial flights using the type of the helicopter that crashed in Norway Friday have been grounded worldwide.
The move came after a helicopter crashed in the North Sea, killing 13 people, including one Briton.
5. ISIS in Syria
U.S. President Barack Obama in a visit to Hanover, Germany, Monday said that he will be sending more U.S. fighters to Syria to help locals fight ISIS.
6. Delhi fire
The entire collection at the natural history museum in Delhi has been destroyed in a fire that severely damaged the six-floor building, officials confirmed Tuesday.
Also in the news:
- U.S. President Barack Obama and former Secretary of State and presidential hopeful Hillary Clinton called on the U.K. to remain in the EU.
- North Korea breached U.N. sanctions after it fired a missile off its east coast, then told the U.S. to stop the nuclear war exercises in the Korean Peninsula so that it also ceases nuclear tests.
- In Brussels, the Maelbeek metro station that was attacked about a month ago reopened Tuesday, but security in it remains high.
- Kenya lighted the world's biggest ivory bonfire Saturday, April 30.
- The first Zika-caused death in the U.S. was reported in Puerto Rico Friday, April 29.