Press freedom groups in Mexico are taking their concerns about missing journalists to the United Nations.

In February 2008, Michoacan reporter Mauricio Estrada Zamora left his newsroom and was never heard from again. Two years later in the same state, journalist Ramon Angeles Zalpa also went missing. State and federal authorities investigated to no avail.

Now, press advocates are going to present the cases to the United Nations, in the hopes of spurring action on these and the more than two dozen other unsolved disappearances of journalists.

“There is 100% impunity in these cases,” said Balbina Flores, the Mexico representative of Reporters Without Borders, which — along with Propuesta Civica — will be presenting the cases to the U.N.