The Observer's 20 photographs of the week

The most compelling photojournalism this week came from the turmoil in Egypt. Here, an injured member of the Muslim Brotherhood and supporter of deposed Egyptian President Mohamed Morsi is carried by members of the riot police and army after they cleared Rabaa Adawiya square area in Cairo, where the Pro-Morsi supporters were camping Photograph: Reuters

A police vehicle is pushed off the 6th of October bridge by protesters close to the encampment of the Morsi supporters in the eastern Nasr City district of Cairo Photograph: Aly Hazzaa/AP

Firefighters and workers stand by the Giza Government headquarters after, according to Egyptian State TV, it was torched by Islamists in Cairo Photograph: Gianluigi Guercia/AFP

The Tartan army landed in London, gathering in Trafalgar Square ahead of their 'friendly' against England which they lost 3-2 Photograph: Dan Kitwood/Getty

The World Athletics Championships continued in Moscow. Here, athletes compete in the final of the women's 20km walk Photograph: Jamie Squire/Getty

A Bahraini anti-government protester reacts to teargas fired by riot police in the village of Shakhura, Bahrain. Protesters clashed with riot police in neighbourhoods around the capital and stores shut their doors amid opposition calls for a general strike, but a tight security clampdown appeared to have stopped large-scale demonstrations Photograph: Hasan Jamali/AP

In the village of Abu Saiba, a Bahraini protester rests after clashes with riot police in a compelling image by photographer Mohammed Al-Shaikh, continuing his critical work from Bahrain Photograph: Mohammed Al-Shaikh/AFP

A meteor is seen during the Perseids shower over Avebury's Neolithic henge monument in Wiltshire Photograph: Tim Ireland/PA

Lady Gaga in eye-catching make up is photographed in Los Angeles Photograph: JB Lacroix/Getty

A Kashmiri school girl looks out the window of a van as it rains in Srinagar, the summer capital of Indian Kashmir Photograph: Farooq Khan/EPA

A hot air balloon flies over Bristol during the International Balloon Fiesta, the largest event of its kind in Europe Photograph: Graeme Robertson/Guardian

Firefighters try to extinguish a fire at an oil refinery in Puerto La Cruz, Venezuela. The fire at the oil refinery started when lightning struck a storage tank Photograph: Reuters

Multiple bolts of lightning illuminate the sky over Mount Vesuvius in the Gulf of Naples, Italy. The dramatic photograph was taken by British tourist Richard Stoodley from his hotel balcony using a basic camera Photograph: Richard Stoodley/SWNS

Explorers examine the 'cathedral' chamber of the Box Freestone mine in Wiltshire. The 125ft tall cathedral chamber, with mist billowing from the ground level opening, is an abandoned mine, dating back to Roman times Photograph: Robbie Khan/Barcroft Media

An Ultra-Orthodox Jewish man withstands a water cannon being fired by Israeli police in Ramat Beit Shemesh, west of Jerusalem. Dozens of Ultra-Orthodox Jews, known as Haredim, protested against the desecration of ancient graves recently discovered at a building site Photograph: Menahem Kahana/AFP

At the same protest, photographer Nir Elias took this striking image of an Israeli policeman dragging away an Ultra-Orthodox Jewish demonstrator Photograph: Nir Elias/Reuters

Jockey Giovanni Atzeni of the Onda parish competes in a horse race in Del Campo square in Siena. Since the mid-1600s, 10 riders compete bareback around Siena's central square in a bid to win the Palio, a silk banner depicting the Madonna and child Photograph: Stefano Rellandini/Reuters

A man sprays water on an iguana during the festivities to honour Managua's patron saint, Santo Domingo de Guzman Photograph: Esteban Felix/AP

Lizards, from the private collection of Thomas Wood, are pictured at the University of Rochester, New York. The leaf-tailed geckos are among some of the species studied by PhD student Daniel Scantlebury for a recent paper describing slowdown in the rate at which species form on Madagascar Photograph: Adam Fenster/Reuters

Supporters of Bradley Manning embrace outside of the court where he testified in his military trial at Fort Meade, Maryland. Manning apologised for giving diplomatic secrets to the WikiLeaks website three years ago, the biggest breach of classified data in US history Photograph: James Lawler Duggan/Reuters