London's FTSE 100 Index joined global markets in tumbling lower after oil prices rocketed above 100 US dollars a barrel for the first time in nearly four years amid a mounting supply crisis caused by the Iran war.The UK blue chip share index fell 1.7% after opening on Monday, down 181 points to 10103.71, after punishing falls last week on the escalating Middle East conflict.

London's FTSE 100 Index joined global markets in tumbling lower after oil prices rocketed above 100 US dollars a barrel for the first time in nearly four years amid a mounting supply crisis caused by the Iran war.The UK blue chip share index fell 1.7% after opening on Monday, down 181 points to 10103.71, after punishing falls last week on the escalating Middle East conflict.