[Migrants disembark from a vessel of ONG Medecins sans Frontieres (MSF) in the Sicilian harbour of Augusta]The number of migrants arriving in Italy from northern Africa increased by about a quarter in June compared to May, European border agency Frontex said on Tuesday. Some 22,500 people arrived on Italy's shores, 24 percent more than in May, most of them coming from Nigeria, Eritrea and Sudan, Frontex said in a statement. The number of migrants arriving in Greece from Turkey was 95 percent lower compared to last year, mainly because of an agreement between the EU and Turkey to send migrants back, as well as stricter controls imposed by the former Yugoslav Republic of Macedonia at its border with Greece.