内容摘要：The gun used in the attack was a 9mm handgun legally purchased in Illinois in March 2020 and brought to Washington in his checked luggage. Illinois has some of the most restrictive gun laws in the US.

The gun used in the attack was a 9mm handgun legally purchased in Illinois in March 2020 and brought to Washington in his checked luggage. Illinois has some of the most restrictive gun laws in the US.

BBC Verify used satellite imagery to identify four potential sites based on the limited available information about their locations.The sites are similar in size, shape and design to existing open-air distribution sites inside Gaza, such as at Erez, Erez West and Kisufim. The largest site we've looked at is bigger - more comparable to the area inside Gaza at Kerem Shalom crossing.

Our analysis of the imagery shows significant development at one of the sites in south-west Gaza, close to the ruins of a village that is now an Israel Defense Forces (IDF) base.Satellite photos since early April show the construction of a road there and a large staging area, surrounded by berms - large defensive barriers made of piled sand or earth - about 650m (2,130ft) from the border with Egypt.A high-resolution image captured on 8 May shows bulldozers and excavators working on a section of land spanning about 20 acres (8 hectares). IDF armoured vehicles are at a fortified building nearby.

A photo taken on site, geolocated by BBC Verify, also shows lighting being installed on the perimeter.Further imagery from 11 and 12 May shows this, along with three other sites, continuing to expand. One site is about half a kilometre from a collection of eight UN warehouses, and 280m from another large warehouse.

Stu Ray - a senior imagery analyst with McKenzie Intelligence - agreed the sites were likely to be secure distribution centres. He noted that some of the facilities are in "close proximity to IDF Forward Operating Bases which ties in with the IDF wishing to have some control over the sites".

Analysts with another intelligence firm, Maiar, said the facilities appeared to be designed with separate entrances for trucks to move in and out, and with other gaps in the berms that would be suitable for pedestrian entrances.Dr Tedros said: "Even if health facilities are not attacked or forced to evacuate, hostilities and military presence obstruct patients and staff from accessing care, and WHO from resupplying hospitals, which can quickly make them non-functional."

"We've seen this too many times - it must not be allowed to happen again."Médecins Sans Frontières (MSF) also said that at least 20 medical facilities across Gaza had been damaged, or forced partially or completely out of service, in the past week by Israeli ground operations, air strikes and evacuation orders.

The charity demanded that Israeli authorities stop what it called the "deliberate asphyxiation of Gaza and the annihilation of its healthcare system".Israel imposed a total blockade on Gaza on 2 March and resumed its military offensive against Hamas two weeks later, ending a two-month ceasefire. It said it wanted to put pressure on Hamas to release its remaining 58 hostages, up to 23 of whom are believed to be alive.