Answer:
Step-by-step explanation:
Based on the information provided within the question it can be said that in a situation similar to that which is being described there is a procedure that must be followed. That procedure would be the following, 
- Immediately evacuate the laboratory
 - Decontaminate any contaminated personnel
 - Post a do not enter sign
 - Quarantine Lab until consultation with the safety group.
 
This procedure must be followed for the safety of all involved.