The Observer has also established that one of the UK companies was allegedly linked to a scandal involving Russian organised crime.
Spanish media said Arronategui was allegedly linked to violence carried out by the Basque separatist group, Eta, and had been living in Britain with his family for several years.
In an interview with the al-Ahram newspaper on Thursday, the 36-year-old said that the company's co-owner who was allegedly linked to the Muslim Brotherhood had left last year.
The demonstrators are "allegedly linked with Islamist terrorists around the world including Taliban," said one group, Burma Democratic Concern, suggesting that the protesters have organized "with the support of the global networks of extremist Islamic terrorists".
Contador, who rides for the Discovery Channel team, missed the 2006 Tour when his former team, Liberty, was disqualified because he and four other riders - plus the team director and doctor - were allegedly linked to Operation Puerto.
I wna b da 1st UK woman 2 kill a UK or US terorrist!" Dare, who previously posted a picture of her toddler son posing with an AK47 rifle, is thought to have been a regular at the Lewisham Islamic Centre, which was allegedly linked to Michael Adebolajo, the killer of fusilier Lee Rigby.
So far, 79 people have been arrested over the presumed massacre on 26 September: all are allegedly linked to a network of corrupt local politicians and police officers in the southern city of Iguala or members of a drug gang called Guerreros Unidos.
