Former Tijuana mayor Jorge Hank Rhon was released from jail Tuesday after a Mexican federal judge ruled officials lacked evidence for the illegal weapons charges against him, but authorities promptly took him into custody again.

This time, state prosecutors brought the wealthy businessman in for questioning related to a murder investigation.

Hank Rhon was arrested earlier this month after a raid on his house turned up 88 weapons and nearly 10,000 rounds of ammunition. Prosecutors have said that two of the guns were linked to two separate killings in 2009 and 2010.

News reports indicate the ex-mayor is now being held in a hotel. Mexican law allows suspects to be held for up to 40 days without charges.

Hank Rohn was mayor of Tijuana, across the border from San Diego, California, from 2004 to 2007.

He is the son of a prominent figure in the Institutional Revolutionary Party, which led Mexico for more than seven decades until 2000 and is trying to win back the presidency next year.

Hank Rohn is also a successful businessman, owning a chain of casinos and a local soccer team.

In 1999, a report by the U.S. National Drug Intelligence Center identified Hank Rhon as having links to drug trafficking, but then-U.S. Attorney General Janet Reno said the report's findings were never adopted as the official government view.

The former mayor, who also ran unsuccessfully for governor of Mexico's Baja California state, has denied allegations of corruption and ties to drug traffickers.