[Standing Wolf]

...thousands of firearms were secreted into Mexico by...

I abandoned the alleged "article" in the first sentence. If you don't know what the verb "secrete" means, but can't come up with enough ambition to exercise a dictionary, kindly don't expect me to waste time listening to you.

[vrwc1]

Looks like you need to enhance your vocabulary. See the definition of secreted: To conceal in a hiding place; cache.