Belgium Frees Jailed Aid Worker in Prisoner Swap with Iran

Belgian aid worker Olivier Vandecasteele was released after over a year of imprisonment in Iran.
In exchange, Iran received convicted Iranian diplomat Assadollah Assadi.
The deal was brokered by Oman and involved a prisoner swap.
Vandecasteele's detention was condemned by human rights groups.
Critics argue the deal could encourage Iran to take more hostages to use as bargaining chips.