Rising tensions on the Korean peninsula - in pictures

A South Korean guard stands at the inter-Korean transit office in Paju. 400 South Koreans remain in the joint industrial complex fearing they cannot get back there once they have returned to the South Photograph: Chung Sung-Jun/Getty Images

North Koreans attend a rally against the US and South Korea in Nampo, North Korea, in this picture released by the North's official KCNA news agency Photograph: KCNA/Reuters

South Korean K-55 self-propelled howitzers are shrouded in smoke during a military exercise in Paju Photograph: Lee Jin-man/AP

A soldier from a South Korean artillery unit participates in military training near the demilitarised zone (DMZ) separating the two Koreas in Paju Photograph: Lee Jae-Won/Reuters

A South Korean employee (top, right) who works at the Kaesong industrial complex is mobbed by the media upon his arrival at South Korea's customs, immigration and quarantine office Photograph: Kim Hong-Ji/Reuters

A US air force A-10 jet (top) comes in to land at a base in Osan, south of Seoul. The US has positioned a warship off the Korean coast as a shield against ballistic missile attack, and also deployed radar-evading F-22 Raptors to take part in the annual joint military drills it carries out with South Korea Photograph: Lee Jae-Won/Reuters

North Korean leader Kim Jong-un visits the Wolnae-do defence detachment on the western frontline in North Korea on 2 April Photograph: ZUMA/Rex Features

A South Korean soldier stands at the checkpoint in Paju Photograph: Chung Sung-Jun/Getty Images

Soldiers from the US army's 23rd Chemical Battalion wear protective gear during a ceremony at Camp Stanley in Uijeongbu Photograph: Jung Yeon-Je/AFPGetty Images

A group of businessmen who run companies in the Kaesong joint industrial park in North Korea stand behind a banner reading 'We appeal for normalisation of passage to Kaesong industrial complex' at a military checkpoint in Paju Photograph: KIM JAE-HWAN/AFP/Getty Images

Anti-war protesters hold signs at a rally denouncing the joint military drills between South Korea and the United States near the US embassy in Seoul Photograph: Lee Jin-man/AP

A US air force F-22 Raptor stealth fighter jet takes off from the runway during military exercises at the Osan airbase in Pyeongtaek, South Korea Photograph: Bae Jung-Hyun/AP

A lorry driver walks between trucks at South Korea's customs, immigration and quarantine area, waiting to enter the Kaesong industrial complex in North Korea Photograph: Kim Hong-Ji/Reuters

South Korean soldiers patrol inside the barbed-wire fence near the border village of Panmunjom in Paju, South Korea Photograph: Chung Sung-Jun/Getty Images