POSTED: Tuesday, May 17, 2011 - 4:05pm
UPDATED: Tuesday, May 17, 2011 - 4:33pm
CHIAPAS, MEXICO- Police in Southern Mexico intercepted 513 immigrants in two tractor trailers headed for the United States.
Authorities have arrested four people accused of smuggling the immigrants.
The immigrants, who are from Central and South American and Asia, were discovered by use of an X-ray machine at a checkpoint in the city of Tuxtla Gutierrez.