<p>Two South Korean air force planes collided in mid-air and crashed Friday, killing three pilots and leaving one more missing, Seoul's military said.</p>.<p>The KT-1 trainer jets crashed near Sacheon town, about 300 kilometres south of the capital Seoul, according to military authorities.</p>.<p>"Two KT-1 trainer jets at the Sacheon Air Base collided in mid-air while training and crashed," the defence ministry said in a statement.</p>.<p>Three pilots were killed in the accident, and one remains missing, it added.</p>.<p>The military will "check the exact situation of damage and investigate the cause of the accident," the statement added.</p>.<p>Over 30 firefighters and emergency responders were dispatched to the crash site, the Yonhap news agency reported.</p>.<p>Friday's crash is the latest incident involving South Korea's air force jets this year.</p>.<p>In January, an air force pilot was killed in an F-5 fighter jet crash.</p>.<p>That incident took place shortly after the country grounded its entire fleet of advanced F-35 fighter jets after one of them was forced to make a dramatic emergency landing after a major systems malfunction.</p>.<p>The Korean Peninsula remains in a technical state of war, as the armistice that ended the conflict in 1953 has yet to be replaced with a peace treaty.</p>.<p><strong>Watch the latest DH Videos here:</strong></p>
<p>Two South Korean air force planes collided in mid-air and crashed Friday, killing three pilots and leaving one more missing, Seoul's military said.</p>.<p>The KT-1 trainer jets crashed near Sacheon town, about 300 kilometres south of the capital Seoul, according to military authorities.</p>.<p>"Two KT-1 trainer jets at the Sacheon Air Base collided in mid-air while training and crashed," the defence ministry said in a statement.</p>.<p>Three pilots were killed in the accident, and one remains missing, it added.</p>.<p>The military will "check the exact situation of damage and investigate the cause of the accident," the statement added.</p>.<p>Over 30 firefighters and emergency responders were dispatched to the crash site, the Yonhap news agency reported.</p>.<p>Friday's crash is the latest incident involving South Korea's air force jets this year.</p>.<p>In January, an air force pilot was killed in an F-5 fighter jet crash.</p>.<p>That incident took place shortly after the country grounded its entire fleet of advanced F-35 fighter jets after one of them was forced to make a dramatic emergency landing after a major systems malfunction.</p>.<p>The Korean Peninsula remains in a technical state of war, as the armistice that ended the conflict in 1953 has yet to be replaced with a peace treaty.</p>.<p><strong>Watch the latest DH Videos here:</strong></p>