Nikos Arvanitidis

A fisherman collects samples from Lake Koroneia, an important ecosystem northeast of Thessaloniki in northern Greece, on Saturday. Scientists are monitoring the water level at the lake, after it dropped to 60 centimeters last week from 3 meters a few years ago, killing thousands of fish.

An owl peers up from its nest in a sanctuary for injured animals in Kalohori, west of Thessaloniki, northern Greece, on Saturday. The sanctuary is run by a team of volunteers and is currently accommodating more than 300 animals ranging from swans and roe deer to hedgehogs and swallows. [Nikos Arvanitidis/ANA-MPA] 

Disabled citizens on Tuesday parked their wheelchairs along the coastal promenade in Thessaloniki, leaving notes saying 'Back in 5 minutes' in a protest against illegal parking by motorists in the northern port city. [Nikos Arvanitidis/ANA-MPA] 

Christian Orthodox activists shout slogans and hold up crosses and placards as they are held back by riot police during a protest outside a theater in Thessaloniki on Wednesday night.

The Iraklis (Hercules) tunnel boring machine, digging below the surface of Thessaloniki for the construction of the northern port city's metro system, Thursday reached Analipsi station, completing one of the twin tunnels on the central line. The line between Neos Sidirodromikos Stathmos and Nea Elvetia is expected to start operating by late 2020.

The Iraklis (Hercules) tunnel boring machine, digging below the surface of Thessaloniki for the construction of the northern port city's metro system, Thursday reached Analipsi station, completing one of the twin tunnels on the central line. The line between Neos Sidirodromikos Stathmos and Nea Elvetia is expected to start operating by late 2020.

Employees are seen working with tobacco at a family enterprise, Vamma Del Sol, at Kria Vrisi village, in Pella Prefecture, Greece. Vamma Del Sol was built in 2012 by two brothers, Aris and Kostas Konstantinidis, who make the product without adding any chemical substances.