The Houston Police Department is investigating a humans smuggling situation Wednesday in southwest Houston, according to authorities.

MEXICO CITY Tourists or locals visiting a cave in north-central Mexico could endanger what is purported to be some of the earliest evidence of human presence in North America, archaeological authorities said Thursday. Mexicos National Institute of Anthropology and History said the remote Chiquihuite cave in Zacatecas state has been declared off-limits to visitors. In this February 2019 photo provided by Mads Thomsen, researchers take samples from different cultural layers in a cave in Zacatecas, central Mexico. Artifacts from the site suggest people were living in North America much earlier than most scientists think. (Mads Thomsen via AP) (Mads Thomsen)The cave is located on a hilltop near the town of Concepcin del Oro, Zacatecas.