Via Reuters, Arms cache was actually scrap metal:
The supposed cache was discovered during a raid Sunday on an unfinished building in a town on the main road to Ivory Coast, fuelling [sic] speculation it was linked to an alleged scheme to smuggle weapons into the country.

Liberian police and soldiers from the U.N. peacekeeping force carried out the raid, which police officials said at the time had unearthed mostly new AK-47 machinegun [sic] ammunition.

"The fact of the matter is those items were just empty shells," Liberia's presidential press secretary Cyrus Badio told Reuters. "The person in question is a scrap dealer."
Also the photo accompanying the article has nothing whatsoever to do with the article.