"Two of our staff have been injured and are receiving medical care," a senior airline official said.
According to the airline, as per initial information, Jet Airways guests in Brussels have been re-located to a safe location by the Brussels Airport authorities.
Passengers and staff are not allowed to access the airport terminals, it said.
Jet Airways is closely monitoring the situation, the airline said.
Brussels airport serves as Jet Airways' European hub for international operations. The airline had, however, recently announced relocation of this gateway to Dutch capital Amsterdam from coming Sunday.
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In view of the situation, the airline has decided to cancel its flights to and from Brussels till tomorrow.
The flights which stand cancelled are from Brussels to Newark, Toronto, Mumbai and Delhi as well as services from Newark and Toronto to Brussels for today.
Jet Airways has also announced cancellation of its flights from Mumbai and Delhi to Brussels scheduled for tomorrow.
The airline said for further information passengers can contact Jet Airways contact centre in India 1800225522, 1-877-8359538 (The United States) and 08081011199 (The United Kingdom).