(CNN) About 4,500 refugees and migrants were rescued from the Mediterranean in just one day, Italian rescue workers announced, as Europe's migrant crisis continues to grow.

On its Twitter account , the Italian coast guard described multiple operations to save migrants from wooden boats over the course of July 5, as people continued to risk their lives to reach Europe.

According to Italian wire service ANSA , the refugees were picked up in the Strait of Sicily between Italy and Libya in 35 separate operations.

More than 220,000 migrants have crossed the Mediterranean so far this year, the International Organization for Migration (IOM) said, including 67,538 to Italy.

In comparison, the IOM said only 8,049 migrants traveled to Europe by land over the same period.

Since January 2016, 2,920 people have died while making the journey by sea, at least 1,000 more than at this point in 2015.

As part of the total, Medecins Sans Frontieres announced their rescue ship Dignity 1 had taken on board about 100 people on Tuesday, all of whom had been floating on a single rubber dinghy.

UPDATE: One of the 100 #people just rescued needed to be winched on board. He's now being taken care of by Dr Erna. pic.twitter.com/tTEyHv0Vj3 — MSF Sea (@MSF_Sea) July 5, 2016

Migrants flee conflict and violence

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Conflict in their home countries has driven millions of migrants toward Europe via the Mediterranean. Those who survive the sea journey are facing tougher challenges on land.

In April, Austria passed stricter laws to allow border guards to turn away asylum seekers at their checkpoints, a move which U.N. Secretary-General Ban Ki-moon called "concerning."