class="YtLlr aHS+3 V-v0y fm7dv _8teMo _5pKBM" data-component="Text">Staff at the coal-fired plant in Prachinburi province, about 160 kilometres east of Bangkok, noticed the steel tube, 30 centimetres long and 13 centimetres wide, was missing during routine checks on Friday. A weekend search failed to locate the 25-kilogram tube containing highly radioactive isotope Caesium-137, said Kittiphan Chitpentham of the National Power Supply Public Company, which owns the plant. This service may include material from Agence France-Presse (AFP), APTN, Reuters, AAP, CNN and the BBC World Service which is copyright and cannot be reproduced