Federal immigration agents arrested more than 100 workers Thursday at a Wal-Mart distribution center under construction in eastern Pennsylvania, authorities said.

The workers were detained on suspected immigration violations and loaded onto buses to be taken to Immigration and Customs Enforcement detention centers for processing, according to Marc Raimondi, a spokesman with the Department of Homeland Security.

More than 50 federal immigration agents, joined by the U.S. Labor Department, Social Security Administration and state police, raided the construction site at the High Ridge Business Park, about 80 miles northwest of Philadelphia.

Assistant U.S. Attorney Chris Fisanick said "foreign nationals" were arrested, but declined to provide any other details about the raid.

Wal-Mart officials did not immediately return a phone call Thursday.

The construction site is near Interstate 81, just northwest of Pottsville, Pa.

Last month, Wal-Mart shut down work on seven stores under construction in North Dakota to check for illegal aliens after two illegal immigrants working on Wal-Mart projects in Bismark were charged with molesting two 13-year-old girls. Charges against one of the suspects were dropped after authorities found out he was a juvenile.

In 2003, a raid of 60 Wal-Mart stores in 21 states led to the arrests of 245 illegal workers. An affidavit related to that case claims that a pair of senior Wal-Mart executives knew cleaning contractors were hiring illegal immigrants. Wal-Mart says that no senior official had any such knowledge.