The two leaders went together to the memorial at Ovcara and laid wreaths at the site of the mass grave President Boris Tadic has become the first Serbian leader to pay his respects to Croatian victims of a notorious 1991 massacre. During a visit to a memorial to 260 people murdered at Vukovar, Mr Tadic gave a statement expressing his "apology and regret". Vukovar was captured in November 1991 afte