A Thai Buddhist monk puts on a gas mask as riot police use water cannon and tear gas, while anti-government protesters attempt to remove barricades outside Government House in Bangkok.
Thailand has been gripped by protests seeking to topple the government of Prime Minister Yingluck Shinawatra, who enjoys support among the rural poor in the populous north and northeast but is opposed by demonstrators mainly from Bangkok's middle class and elite.
Dylan Martinez: "What do you say when your boss calls and asks if you want a trip to Bangkok? Simple, say yes.
It was my youngest daughter's birthday so I couldn't leave until the next day - an understanding boss and equally understanding family is essential.
A long flight and an inability to sleep in a chair is not a great mix when you have to walk off a plane and start working, but I guess that's why we are blessed with adrenaline.
I took a tuk-tuk to the nearest demo and then began clicking away. A couple of long but basically peaceful days followed during which everyone seemed to consolidate positions.
Then protesters started attacking police lines. Stones, rocks, rubber bullets, the odd live round, water bottles, molotov cocktails, sling shots, water cannon and teargas, my goodness so much teargas followed.
Taking pictures in this environment is not necessarily always the easiest thing to do. To the left they are throwing teargas, to your right they are launching molotov cocktails, behind you someone is using a sling shot and then a guy is adjusting his gas mask as water cannon is being fired. The voice in your head is saying: 'it's a Buddhist monk, stupid, take a picture'. Oh yeah, remember to take a picture. Best advice ever."
Camera: Nikon D4, 70-200 lens, 400 ISO, 1/250, f4.5