Six people in Hawaii were among 2,900 illegal immigrants with criminal records arrested over seven days recently in the largest nationwide crackdown of its kind, according to U.S. Immigration and Customs Enforcement.

All of those taken into custody had prior criminal convictions in the United States, and at least 1,282 had multiple criminal convictions, ICE said in a statement today. More than 1,600 of those arrested had felony convictions, including manslaughter, attempted murder and kidnapping.

About one million illegal immigrants in the U.S. have been convicted of crimes. Of the 390,000 people ICE removes from the country annually, more than half have criminal records, he said.

The operation was the second such nationwide sweep known as “Cross Check.” In June, immigration officials said they arrested more than 2,400 illegal immigrants who had previously been convicted of crimes.