Diyarbakir, Turkey - Heavy storms, landslides, flash floods and lightning have killed at least 23 people in Europe and Turkey, officials said on Monday.

Nine people died in eastern Turkey, including six killed in severe flooding in mountainous Agri province near the Iranian border, where river waters were swollen by melting snows. Two more people were missing.

In nearby Van province, a two-year-old child died when landslides triggered by heavy rain demolished a house. Two other girls also died and another person was injured after being struck by lightning.

Six hikers died in Greece while trying to cross a river in the south. They were in a group of 18 people swept away by a flood wave in the rain-swollen Lousios river. Prosecutors charged the hike's organisers with involuntary manslaughter.

In France, two divers and a yachtsman drowned on Sunday off the western coast of Brittany in extreme weather.

The yachtsman fell into the sea from his 21-metre boat in heavy seas. The two divers were part of a group of six who were caught up in strong waves. The others made it safely to shore.

In northern Bosnia, two 11-year-old children, a boy and a girl, died after being struck by lightning on Saturday, local media reported.

In Germany, three construction workers building a windmill in the eastern state of Brandenburg were killed on Sunday when lightning hit a tractor they were sheltering under, police said.

In Russia, by contrast, meteorologists said Monday was the hottest May day in Moscow since records began with temperatures hitting 32.7 degrees Celsius (91 degrees Fahrenheit).

The city's electricity system shifted into emergency mode to cope with demand, largely from people using air conditioners.

Extreme weather -- including drought, heavy storms, flooding and flash frost -- have wreaked havoc across Europe this spring.

Aside from the human toll, it has also destroyed crops and damaged infrastructure in France, Spain, Poland, Bulgaria, Turkey and other countries.