Tanzanian Ahmed Ghailani faces a mandatory minimum sentence of 20 years after his conspiracy conviction Wednesday in the first civilian trial of a former Guantanamo Bay inmate, prosecutors said.

Ghailani, 36, was found not guilty on a slew of charges including conspiracy to plot with Al-Qaeda to kill US citizens in the attacks against the Tanzania and Kenya embassies, in which 224 people died.

The jury, deliberating on the fifth day after a four-week trial, found him guilty only of conspiracy to destroy US property.

But a spokeswoman for the prosecutors said he faces a mandatory minimum sentence of 20 years for this conviction and could get life.