On Monday many of the residents of Tyden Lofts in Hastings were allowed to return home to their apartments on the second and third floors of the three story complex according the Barry Eaton District Health Department after it was deemed safe. First Floor residents, however, are still prohibited from entering their apartments while response teams continue to collect and test environmental samples. During a news briefing on Monday, Health Deparment officials said the top two floors as well as the elevator and a stairwell are now open, while the affected first floor is sealed off.

145 tenants were evacuated on Thursday and one person was hospitalized after tests confirmed a resident was exposed to ricin. According to the BEDHD, the person hospitalized allegedly was making the deadly poisonous substance in their first floor apartment. The FBI is looking into how and why the ricin was made.

Testing was also offered to first responders and to residents and employees of Tyden Lofts, who may have been concerned that they were exposed to ricin. Barry-Eaton District Health Department spokesperson Emily Smale said so far there haven’t been any other symptomatic people who were involved in the incident at all.