In the following two months, on the back of visits to Islamabad by senior Saudi and Bahraini officials, sources say at least 2,500 former servicemen were recruited by Bahrainis and brought to Manama, increasing the size of their national guard and riot police by as much as 50 per cent.
"We know that continued airplanes are coming to Bahrain and bringing soldiers from Pakistan," Nabeel Rajab, president of the Bahrain Centre for Human Rights, told Al Jazeera.
"We do not know the exact number, but we know that it is much more than 1,500 or 2,000 people."
Recruited into the special forces, the national guard, and the riot police, the Pakistani citizens are tasked with suppressing Shia protesters that are reportedly demanding equal rights after years of alleged oppression at the hands of the royal family, part of Bahrain's Sunni minority.
"Our own Shia cannot join the security forces, but the government recruits from abroad," said Rajab.
On the ground in Pakistan, the recruitments were handled by the Fauji Foundation, one of the largest conglomerates in the country with close ties to the Pakistani military. In addition to the Overseas Employment Services, which is tasked with providing job opportunities for retired military personnel, the foundation owns large cereal and gas companies, sugar mills, security firms, as well as hospitals and universities.