I watched it yesterday on TV news and read today at Al Jazeera again. It happened on April 28: the immigrants were trying to reach southern Spain on an inflatable motor boat and were intercepted by a Moroccan militray ship that sent a group on another boat. One of the soldiers punched a hole with his knife, saying: try to reach Spain now.
According to the survivors account they managed to continue barely but the Moroccans insisted and attacked the boat again with the knife. They begged for their lives but the soldiers ignored their plea. A handful of them managed to reach the Algerian coast but most drowned.
It reminds me of the Berlin Wall, really. It seems that EU has bought the Moroccan authorities throughtly and now they serve their masters with extreme criminal efficiency.