External approach
Besides going through your company internally, you may be able to learn more through outside avenues.
And educating yourself this way first may (a) clue you in on where to get more info within your company, and (b) make you appear as a seriously interested professional rather than a nosey gossip.
Regulatory bodies
The Answer by KapplerAnswer by Kappler suggests checking with regulatory agencies for any reports. To my mind, possibilities include:
- chemical industry body
- trade union
- government regulatory body
- police & fire & hazmat agencies
Public disclosure laws
If your country or the EU has public disclosure laws akin to:
- Freedom Of Information Act (FOIA) in the United States
- Washington State Public Disclosure Act, in WA, US
…you may be able to formally request any documents related to the incident.
The staff assigned to handling these formal public-disclosure requests are trained in compliance with the law. So you will likely get a better, faster, and fuller response through this channel rather than a casual request to other clerks in the agencies.