Independent Democrats leader Patricia de Lille said on Sunday she was considering a legal challenge to government over its decision not to prosecute Deputy President Jacob Zuma.

"The decision not to prosecute Deputy President Jacob Zuma has shocked me especially since the Scorpion's head Bulelani Ngcuka has publicly confirmed that there is prima facie evidence implicating him in criminal activity.

"This form of selective justice is typical of the government," De Lille said.

Ngcuka announced on Saturday that Zuma would not be prosecuted over allegations of corruption connected with South Africa's multi-billion rand arms deal, despite indications that there may be a case for him to answer to.

De Lille said: "I had to face ridicule, insults and even death threats when I first made public the irregularities surrounding the arms deal and was also told that there was no prima facie evidence.

"Now we find there is prima facie evidence and yet there is no prosecution. I intend consulting my attorney in order to consider the appropriate action to take," De Lille said.

With acknowledgements to Sapa and the Business Day.