Greek shipwreck: hi-tech investigation suggests coastguard responsible for sinking

Research into loss of trawler with hundreds of deaths strongly contradicts official accounts - while finding a failure to mobilise help and evidence that survivor statements were tampered with

Attempts by the Greek coastguard to tow a fishing trawler carrying hundreds of migrants may have caused the vessel to sink, according to a new investigation by the Guardian and media partners that has raised further questions about the incident, which left an estimated 500 people missing

The trawler carrying migrants from Libya to Italy sank off the coast of Greece on 14 June. There were 104 survivors.