Police in Kenya said Tuesday they broke up a terror cell linked to the Islamic State after uncovering plans for "large-scale attacks" including a plot to unleash Anthrax on that country.

Anti-terror officers arrested Mohammed Abdi Ali, a medical intern at the Wote District Hospital in Makueni County, along with his wife, Nuseiba Mohammed Haji, a medical student in Uganda.

The suspects had aimed to launch attacks on the scale of the 2013 Westgate Mall siege in Nairobi, Reuters reports. That assault, on a busy shopping day, killed more than 60 people.

Separately, the group was in touch with medical experts who helped plot a biological attack using anthrax, investigators add.

“Ali has been engaged in the active radicalisation, recruitment of university students and other Kenyan youth into terrorism networks,” police said.

Two of Ali's alleged accomplices, medical interns Ahmed Hish and Farah Dagane, have gone into hiding, according to police chief Joseph Boinnet.

Police did not say whether the suspects had links to the Somali terror group al-Shabab, which claimed credit for the Westgate Mall attack.