The Observer's 20 photographs of the week

Fierce fighting continued in Deir al-Zor in eastern Syria where a senior military intelligence officer Jamaa Jamaa was killed. Here, in the same city, a Free Syrian Army fighter carries his weapon as he takes position inside a house Photograph: Khalil Ashawi/Reuters

Muslim pilgrims walk to cast stones at a pillar, symbolising the stoning of Satan, in a ritual called Jamarat, a rite of the annual Hajj, in Mina near the holy city of Mecca, Saudi Arabia Photograph: Amr Nabil/AP

Football fans are reflected in Anish Kapoor's Sky Mirror outside the AT&T stadium before an National Football League game between the Dallas Cowboys and the Washington Redskins in Texas. The concave disc covered in polished steel had been exhibited in New York, London and Sydney before being permanently positioned here Photograph: Sharon Ellman/AP

Photographer Adrian Dennis captures the moment that secured England's qualification to next year's World Cup Finals in Brazil. Steven Gerrard runs through the Polish defence to score the second goal for England Photograph: Adrian Dennis/AFP

In London, visitors look at the work at the Frieze Art Fair 2013
Photograph: Sarah Lee/The Guardian

A detail of Willem Boshoff's Flag is seen at the Johannesburg-based Goodman Gallery's stand at the Frieze Art Fair Photograph: Andrew Winning/Reuters

An Israeli soldier sleeps in a bunker at the Israeli-annexed Golan Heights during a military exercise. Tension has risen at the Golan Heights since the start of the conflict in Syria Photograph: Menahem Kahana/AFP

Smoke billowing from fires to the west of Sydney arrive over the city's harbour Photograph: James D Morgan/Rex

Photographer Mohammed Al-Shaikh continued his excellent work covering the unrest in Bahrain. Here, protesters clash with riot police in Manama following the funeral of Yussef al-Nashmi, who died in hospital after being detained by Bahraini authorities since August Photograph: Mohammed Al-Shaikh/AFP

And here, in another photograph by Mohammed Al-Shaikh, a Bahraini boy mourns during the funeral of Yussef al-Nashmi in Manama Photograph: Mohammed Al-Shaikh/AFP

People hold flowers and pictures of the late General Vo Nguyen Giap as they gather at his burial site in Quang Trach, Vietnam Photograph: AP

Thania Sayne collapses against the grave of her husband during the playing of taps during a nearby burial service at Arlington National Cemetery Photograph: Manuel Balce Ceneta/AP

Russian protest leader Alexei Navalny speaks with his wife Yulia during a break in the hearing of his case at a court in Kirov. The Russian court reversed Navalny's five-year prison sentence to a suspended term Photograph: Vasily Maximov/AFP

Demonstrators clash with police after a march of striking teachers took place to mark National Teachers Day in Rio de Janeiro, Brazil Photograph: Christophe Simon/AFP

A broad-snouted caiman swims in a water channel in the affluent Recreio dos Bandeirantes suburb of Rio de Janeiro, Brazil. Some 5,000 broad-snouted caimans live in the lagoon systems west of the city, conservationists say, and there s a chance that spectators and athletes at the 2016 Olympics could encounter them Photograph: Felipe Dana/AP

A surfer leaps into the sea from Lighthouse Point, Santa Cruz, California, because he was late for a surfing competition. The photographer Allen Hughes had been photographing a surfing contest when he noticed the late competitor racing along the rocky outcrop Photograph: Allen Hughes/Caters News Agency

A Hypsiboas Picturatus frog (Imbabura tree frog) is photographed at the Jambatu Centre for Research and Conservation of Amphibians in Quito, Ecuador. The centre manages some 40 species of amphibian, and runs successful breeding programmes for critically endangered species Photograph: Guillermo Granja/Reuters

Sameena Hazrat, five, a Pakistani girl who was displaced with her family from Pakistan's tribal areas due to fighting between the Taliban and the army, celebrates the Muslim holiday of Eid al-Adha in Islamabad, Pakistan Photograph: Muhammed Muheisen/AP

A jockey spurs the cows as they race in Batusangkar, Indonesia. The traditional cow racing is held annually in muddy rice fields to celebrate the end of the harvest season by the Minangkabau people Photograph: Robertus Pudyanto/Getty

A participant balances on a stretched belt during a slackline event organised at the Tunderszikla rock in Budapest, Hungary Photograph: Balazs Mohai/AP