Amnesty International has called for Israel to launch an immediate, credible and independent investigation into its killing of at least 10 activists on the Gaza aid flotilla.

Jewish Voice for Peace has condemned Israel's attack and killing of members of the Freedom Flotilla aiming to bring much-needed aid to the besieged Gaza Strip.

Palestinian Christians have urged protests by church groups around the world against an Israeli assault on ships bringing aid to Gaza, which has led to the deaths of at least 10 activists.

In an Easter message, South African church leaders and Christian, Jewish and Muslim theologians have expressed solidarity with Palestinian Christians - as Gaza comes under attack again.