This is the best summary I could come up with:

According to the UN’s International Organization for Migration, tens of thousands of people a year attempt a perilous journey, crossing by sea from the Horn of Africa to Yemen and then travelling on to Saudi Arabia.

Dozens of migrants were killed two years ago when fire tore through a detention centre in the capital, Sanaa, run by the country’s Houthi rebels who control most of northern Yemen.

Reports of widespread killings perpetrated by Saudi security forces along the northern border first surfaced last October in a letter by UN experts to the government in Riyadh.

They highlighted “what appears to be a systematic pattern of large-scale, indiscriminate cross-border killings, using artillery shelling and small arms fired by Saudi security forces against migrants.”

The BBC has approached the Saudi government for comment about the allegations made by UN rapporteurs, the Mixed Migration Centre and Human Rights Watch, but has not received a response.

In a letter sent to HRW in response to the report, the Houthi-led government in Sanaa said it was aware of “deliberate killings of immigrants and Yemenis” by Saudi border guards.

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