Aline Bastin, who according to her LinkedIn profile has worked for the Community of European Railway and Infrastructure Companies (CER) since September 2012, has been widely reported to be unaccounted for since the blasts on Tuesday morning.
Several media outlets have included an appeal for information from a Facebook friend of Bastin, 29.
Comments this morning under that Facebook post have speculated that Bastin may have been on a train struck in the blast. Another said that those who knew Bastin had been asked not to speak to press.
PRWeek attempted to contact CER, but received no response.
Separately, two PR and creative professionals who had previously appeared on lists of missing persons have reported themselves safe on Twitter.
Katleen Brusselmans, formerly head of PR at technical, energy and business process solutions firm Cofely (now known as Engie), used the network to offer shelter to those affected, while David Crunelle, a senior art director at Brussels graphic and strategic comms agency Navalorama and also lecturer at a comms and business school, thanked students for their messages of support and concern.
The BBC reports a total of at least 31 victims of the attack.