NASSAU, Bahamas (AP) — On the first day new immigration rules took effect this month in the Bahamas, officers in green fatigues swept through poor sections of the capital filling two yellow school buses with dozens of people who couldn’t document their right to be in the island chain.

The government, amid fierce criticism of the raid, later insisted the timing of the operation was coincidence. Still, the message of the surprise morning raid, in which the officers were accompanied by local media, couldn’t be clearer: The Bahamas aims to become less hospitable to its swelling population of migrants lacking legal status.

“The fact is that illegal migration is a huge problem for us,” Foreign Minister Fred Mitchell said in a recent interview. “We spend enormous resources for it. It is a drain on our social services, health care and education and we need to get the matter under control.”

The island chain of about 360,000 has a foreign-born population of more than 18 per cent, according to an official report released last month. While the precise number of those who migrated illegally is unclear, the islands long have drawn migrants sailing from nearby Haiti. Census figures from 2010 show more than one out of 10 people in the Bahamas is Haitian, up from 3.6 per cent in 1970.

Mitchell said haphazard enforcement of existing laws has put too many people in legal limbo and has made the Bahamas a magnet for migrants, arriving often in dangerously overloaded smuggling vessels.

But the manner in which the Bahamas is carrying out this tightening of its borders is coming under criticism from human rights activists, who complain of arbitrary and heavy-handed enforcement that is sparking fear in the shantytowns where many migrants live.

“People are afraid to go to work,” said Annette Martinez, a human rights lawyer documenting the situation with local activists. “They say `We are afraid because at any moment the immigration officers will come or their bosses will identify them as foreigners.'”

Martinez also said conditions at the detention centre where migrants are held are “appalling,” with heavy crowding and poor access to adequate food, sanitation or medical care.

The government says it’s working to reduce the population in the detention centre and sent two planeloads of migrants to Haiti on Wednesday. “In the Bahamas, they treat Haitians like dogs,” Youtchike Dormeus, an 18-year-old deportee, said as she got off the plane in Port-au-Prince. The country, which denies treating anyone inhumanely, has deported 3,000 people this year.

Under the new rules that took effect November 1, everyone must have the passport of their nationality and, if they are not a Bahamian, a valid residency or work stamp. In addition, the government is tightening the process for employers to receive work permits for non-Bahamians and requiring first-time applicants for residency permits to apply in their home countries.

Mitchell says The Bahamas briefed Haiti’s government before the new rules took affect and was assured it could provide the passports and other documents needed by Haitians. He has defended the new policies in blunt terms. “You can’t just jump off a boat with your wet feet and come into the immigration department and apply for a work permit,” he told Parliament.