An independent study published in an Italian newspaper has suggested that the death toll from the coronavirus pandemic in the country’s worst-hit region might be higher than what the official data showed.

According to the study by data analysis firm InTwig, whose findings were published in local daily L’Eco di Bergamo, about 4,500 people have died from COVID-19 in March around the northern city of Bergamo. That is more than double the official data of 2,060 deaths provided by Italy’s Civil Protection Department.

The northern Lombardy region — where Bergamo is located — is the epicenter of the Italian

Read more: COVID-19: Study suggests Italy death toll much higher