Cryptocurrency markets are in turmoil as so-called stablecoins, designed to be protected from extreme volatility, have tumbled in recent days. One such token, Luna, has all but evaporated, plunging from a high of $118 last month to less than one cent. Plus, the airline industry is struggling with staff shortages ahead of the summer holiday season – we find out why.

Four people, including a 2-month-old infant, survived after a helicopter they were travelling in crashed outside a church in West Philadelphia on Tuesday.

The Indian Air Force confirmed that the country's military chief of defense staff, Bipin Rawat, was aboard a helicopter that crashed in the south of the country.

It is not the best of times for the Nigerian Armed Forces as the loss of its best hands and equipment is fast becoming unbearable as the country continues its war against insurgents and insecurity. And as we mourn the last victims, one of the questions on the mind of many Nigerian's remains; Why have two American-made Beechcraft Kingair 350 crashed just two months apart from each other? Is it really time to audit the Nigerian Air Force fleet?

Almost 500 people were on board the train when it derailed on the east coast of Taiwan. Rescuers are still trying to reach passengers stuck in carriages.

Salvage teams in eastern Taiwan manage to remove most of the damaged carriages at the site of the worst train crash in recent decades. At least 50 people were killed and more than 200 were injured in Friday's crash, which sent a packed eight-car train hurtling into the sides of a narrow tunnel near the eastern coastal city of Hualien. The pulverised front car, where many of the fatalities took place, remains inside the tunnel.

The pilot, three crew members and five members of the Afghan special forces died in the crash. Afghanistan has been suffering a wave of deadly violence in recent months.

NAF plane crash: Scavengers picking metal items as Bassa community recounts experience

Aerial view of the area where the missing passenger jet is believed to have crashed off the coast of Indonesia's capital Jakarta and comments from Air Force assistant to the chief of staff. A Sriwijaya Air Boeing 737 crashed into the Java sea shortly after take off with 62 people on board.

Here are a few reasons to pick up a copy of The Guardian on Friday. Find these stories and much more when you grab a copy of The Guardian on Friday.

Here are a few reasons to pick up a copy of The Guardian on Sunday. Find these stories and much more when you grab a copy of The Guardian on Sunday.

Three people were killed when a passenger train derailed in northeastern Scotland after a night of stormy weather. Prime Minister Boris Johnson has described the crash as "a very serious incident."