Question: The explosive Pyrotol was known for being used in a 1927 bombing commited by who?

Pyrotol was an explosive available for a time after World War I.  It was reprocessed from military surplus.  Usually used in combination with dynamite, it created an incendiary blast.  The substance was known for being used to commit the Bath School bombing in 1927 and distribution of pyrotol for farm use was discontinued in 1928 due to exhaustion of the supply of surplus explosives.  Since it was very inexpensive, it was often used by farmers to remove tree stumps and clear ditches. <SEP> Pyrotol is a catalyst used in the industrial production of benzene through a process known as pyrolysis.  It is a proprietary chromium-alumina catalyst manufactured by Clariant International (formerly known as Sud-Chemie) and licensed exclusively to CB&I Lummus Technology, Inc..  It is completely unrelated to the explosive pyrotol. <SEP> The 2004 Grozny stadium bombing occurred on 9 May 2004 when a bomb exploded in the Dynamo stadium in the Chechen capital, Grozny, killing 10 people including the republic's president Akhmad Kadyrov and another 100 people were wounded.  Kadyrov's election was considered by many to be by a fraudulent vote.  The explosion was caused by a bomb planted underneath the concrete floor of the VIP podium and occurred at 10:35am during a parade and concert in Groznyy celebrating the 59th anniversary of the victory of Germany in World War 2.  The blast tore a hole in the section designated for dignitaries.  It was not clear if the explosion was specifically targeting Kadyrov or whether it would have occurred regardless of his presence, as he was not officially scheduled to be at this event.  Khussein Isayev, chairman of the Republic's state council, and Adlan Khasanov, a reported for Reuters, were also killed in the blast.  Col. Gen. Valery Baranov, the commander of the Russian military in the northern Caucasus was gravely wounded.  Although estimates of total casualties varied, at least ten people were killed and around fifty more injured.  The numbers include many civilians and WW2 veterans who were also attending the celebrations.  Officials believe that the blast was detonated by remote control and was intentionally installed below the VIP section.  The bomb may have been planted some time ago during the recent renovations to the stadium.  Preliminary reports suggest that the bomb was equivalent to one ton of TNT.  The location of the bomb made it impossible for existing equipment to detect.  The type of explosive appeared identical to one used to blow up the military parade two years ago in the Dagestani city of Kaspiysk.  Rescue workers prevented two other blasts in the stadium.  They were able to defuse another landmine and an additional explosive device equipped with a timer set to go off 30 minutes after the first explosion. <SEP>  Kehoe killed his wife and firebombed his farm, then detonated an explosion in the Bath Consolidated School before committing suicide by detonating a final device in his truck. The Bath School disaster, sometimes known as the Bath School massacre, was a series of violent attacks perpetrated by Andrew Kehoe on May 18, 1927 in Bath Township, Michigan, which killed 38 elementary schoolchildren and 6 adults and injured at least 58 other people.  It is the deadliest mass murder to take place at a school in United States history.