And Islamic Jihad came out with their own numbers:
Al Qassam statistic for March,2008
34 martyrs ; 89 Qassam rockets ; 534 mortar shells towards Zionist targets ; 12 Zionist were killed; other 79 were injured
First: Al Qassam martyr :
Second: Resistance activities:
Third: Zionist losses:
Day and date
The Zionist losses
Saturday 1st of March,2008
4 Zionist were killed
Thursday 6th of March,2008
8 Zionist were killed
18 killed versus 2 "Zionists"
216 rockets and mortar shells
Hamas' rocket numbers are low if you assume that they are taking credit for all groups' rocket attacks, so they must only be talking about their own rockets - the total Qassam count for March was over 200.
Which implies that they are taking credit for only the Israelis killed by Hamas as well.
And since they list 8 "Zionists" killed on March 6, this means that Hamas is taking credit for the Mercaz HaRav massacre (they denied initial claims of responsibility and the only group to officially take credit was the unknown "Galilee Freedom Batallions".)
Of course, this report includes out and out lies - four Israelis weren't killed on March 1, and the total number of Israelis killed in March was 11 (they might be including the Qassam victim from February 27.)
Still, this is apparently the first official, if backhanded, claim of responsibility for the massacre.