Rucksack bombs used in the Madrid train bombings were set off by mobile phone and contained copper detonators that are not generally used by armed Basque separatist group ETA, a radio report said this afternoon.
Cadena Ser radio station quoted security sources as saying the bombs, which blew up on four trains and killed 198 people, were activated by mobile telephones that had their alarms set for 7:39 a.m. (6.39 Irish time) yesterday.
The detonator in an unexploded bomb recovered by police contained a copper detonator whereas the detonators commonly used by ETA are made of aluminium, the report said.
The Interior Ministry could not immediately confirm the report.