Uzbekistan media have reported an explosion on a railway line on the Central Asian nation's border with Afghanistan.
The rail route lies on a distribution network used for the supply of goods to United States troops serving in Afghanistan, but the cause of the blast was unclear.
News site Gazeta.ru reported Saturday that nobody was killed in the explosion which reportedly occurred Wednesday night. It said a commission has been set up to investigate the incident.
Information is strictly guarded by Uzbekistan's authoritarian government, which has not released any information on the blast.
Privately operated Uzmetronom news site, based in the Uzbek capital, Tashkent, said investigators are probing a possible terrorist link.