OPEC siege members of OPEC were taken hostage in Vienna, Austria, where the ministers were attending a meeting at the OPEC headquarters at Dr-Karl-Lueger-Ring 10 (renamed Universitätsring in 2012). The hostage attack was orchestrated by a six-person team led by Venezuelan terrorist Carlos the Jackal (which included Gabriele Kröcher-Tiedemann, Hans-Joachim Klein and Anis al-Naqqash). The self-named "Arm of the Arab Revolution" group called for the liberation of Palestine. Carlos planned to take over the conference by force and kidnap all eleven oil ministers in attendance and hold them for ransom, with the exception of Ahmed Zaki Yamani and Iran's Jamshid Amuzegar, who
Damp (structural) that it is possible to guarantee a consistent dose of active ingredient into each hole drilled in the mortar course – i.e. it is impossible to under-fill the holes. Porous tubes are installed along a mortar course. In theory these encourage evaporation and reduce the rise of the damp. Independent test certification are available for this type of product and tests carried out by the Building Research Establishment suggest that they are effective at controlling rising damp. It has been suggested that improving drainage around walls affected by rising damp can help to reduce the height of rise by reducing