Troops advance on protesters in Thailand

Soldiers watch for anti-government snipers near Lumphini park in downtown Bangkok Photograph: Sakchai Lalit/AP Photograph: Sakchai Lalit/guardian.co.uk A pall of smoke hangs over the redshirt protesters' fortified encampment in central Bangkok Photograph: Pedro Ugarte/AFP/Getty Images Photograph: Pedro Ugarte/guardian.co.uk An anti-government protester fires a slingshot at military forces Photograph: Andy Nelson/Getty Images Photograph: Andy Nelson/guardian.co.uk Troops restrain a protester during street clashes Photograph: Andy Nelson/Getty Images Photograph: Andy Nelson/guardian.co.uk Anti-government demonstrators set fire to a police bus near Lumphini park Photograph: Sakchai Lalit/AP Photograph: Sakchai Lalit/guardian.co.uk Protesters fire makeshift rockets at soldiers Photograph: Wason Waintchakorn/AP Photograph: Wason Waintchakorn/guardian.co.uk Demonstrators watch soldiers from behind barricades made of tyres Photograph: David Longstreath/AP Photograph: David Longstreath/guardian.co.uk A person injured in clashes between troops and protesters is carried away Photograph: Manan Vatsyayana/AFP/Getty Images Photograph: Manan Vatsyayana/guardian.co.uk Soldiers chase protesters after firing teargas at them Photograph: Vincent Yu/AP Photograph: Vincent Yu/guardian.co.uk Soldiers take a rest under an overpass Photograph: Wong Maye-E/AP Photograph: Wong Maye-E/guardian.co.uk Soldiers take up positions in a street near the redshirts' barricades Photograph: Wong Maye-E/AP Photograph: Wong Maye-E/guardian.co.uk A protester is treated after being shot during clashes with troops Photograph: Barbara Walton/EPA Photograph: Barbara Walton/guardian.co.uk