Tom Mintier: Explosion in Afghanistan

(CNN) -- An ammunitions dump exploded Friday in Spin Boldak, just across the Pakistan border in Afghanistan, killing at least one person and injuring dozens of others. Authorities say the death toll is expected to rise.

CNN Correspondent Tom Mintier is covering the incident from Pakistan. He spoke Friday to CNN's Carol Costello.

MINTIER: It's a developing story. We still don't know how many people actually have been killed by this accident, but the death toll may go very, very high. They say there is a possibility of at least 50 people being missing.

At 2:30 in the morning, a weapons depot -- that was basically captured weapons after the Taliban fled Kandahar, stockpiled in Spin Boldak -- exploded. It started exploding after midnight and carried on for several hours.

As far as Chaman several miles way, windows were reportedly broken out, and people were awakened in the middle of the night. The injured, many of them, were brought across the border from Afghanistan into Pakistan. ...

We still don't know how many people were killed. It's possibly as many as a dozen or even more. It will take some time before they can sort it out, but they are doing that right now.

Apparently, a great scene of devastation after these weapons went off, several rockets and mortars flying through the air, but several miles away, people could feel the shock waves and see a fireball in the sky inside Afghanistan.

No Americans were involved from the base in Kandahar nearby, but casualties (were) mostly Afghans, it appears right now from the military, who were guarding this weapons depot.

COSTELLO: The governor of the Kandahar province was keeping the stockpiled weapons. Why?

MINTIER: Well, after the Taliban basically vacated the area, there were a lot of weapons left behind, a lot of mortar shells, a lot of rockets and things like that. These were apparently gathered for safekeeping by Afghan authorities. And the word we received from Pakistani government officials is that the governor of Kandahar was the custodian, if you will, of these weapons that had been stored there after the Taliban fled.

Just how safe they were kept is something I am sure that's going to be investigated. There were reportedly plans to move this weapons depot away from the residential area, but the plans were not put into action before it exploded.