Question: How many people died in the event that is memorialized at  The Port Chicago Naval Magazine National Memorial?

Context paragraphs:
Port Chicago disaster: The Port Chicago disaster was a deadly munitions explosion that occurred on July 17, 1944, at the Port Chicago Naval Magazine in Port Chicago, California, United States.  Munitions detonated while being loaded onto a cargo vessel bound for the Pacific Theater of Operations, killing 320 sailors and civilians and injuring 390 others.  Most of the dead and injured were enlisted African American sailors.

Seal Islands (California): Seal Islands are a pair of islands in Suisun Bay at the mouth of the Sacramento-San Joaquin River Delta in Contra Costa County, California, 10 km east of Benicia, and 500 metres off-shore from the former Concord Naval Weapons Station and Port Chicago Naval Magazine.

Concord Naval Weapons Station: Concord Naval Weapons Station was a military base established in 1942 north of the city of Concord, California at the shore of the Sacramento River where it widens into Suisun Bay.  The station functioned as a World War II armament storage depot, supplying ships at Port Chicago.  Concord NWS continued to support war efforts during the Korean War, the Vietnam War and the Gulf War, processing and shipping thousands of tons of materiel out across the Pacific Ocean.  During World War II it also had a Naval Outlying Field at the southern edge of the base.  It ceased being an operating airfield after World War II.

1692 Jamaica earthquake: The 1692 Jamaica earthquake struck Port Royal, Jamaica on June 7.  A stopped pocket watch found in the harbor in 1969 indicated that it occurred around 11:43 a.m. Port Royal was, at the time, the unofficial capital of Jamaica, and one of the busiest and wealthiest ports in the West Indies.  It was known both as the "storehouse and treasury of the West Indies" and "one of the wickedest places on earth", being a common home port for the many privateers and pirates operating within the Caribbean Sea.  The earthquake caused most of the city to sink below sea level and about 2,000 people died as a result of the earthquake and the following tsunami.  About 3,000 people died in the days following the earthquakes due to injuries and disease.

African and Caribbean War Memorial: The African and Caribbean War Memorial in Brixton, London, is the United Kingdom's national memorial to African and Caribbean service personnel who fought in the First and Second World Wars.  It originated with a project for a memorial to Caribbean Royal Air Force veterans of World War II who arrived in Britain in 1948 on the MV "Empire Windrush"; this was an extension of the commemorative plaque and sculpture scheme run by the Nubian Jak Community Trust to highlight the historic contributions of Black and minority ethnic people in Britain.  The memorial was originally to have been placed at Tilbury Docks, as part of the commemoration for the centenary of the outbreak of World War I. However, as the project began to evolve into a larger tribute that included both World Wars and commemorated servicemen and women from both Africa and the Caribbean, it was agreed by the memorial recipient – the Port of Tilbury – and the project organisers that a new, more accessible location needed to found.  The memorial was ultimately permanently installed and unveiled on 22 June 2017 in Windrush Square, Brixton.

Benjamin Franklin National Memorial: The Benjamin Franklin National Memorial, located in the rotunda of The Franklin Institute science museum in Philadelphia, Pennsylvania, U.S., features a colossal statue of a seated Benjamin Franklin, American writer, inventor, and statesman.  The 20 ft -tall memorial, was sculpted by James Earle Fraser between 1906 and 1911 and dedicated in 1938.  With a weight of 30 ST the statue rests on a 92 ST pedestal of white Seravezza marble.  It is the focal piece of the Memorial Hall of the Franklin Institute, which was designed by John Windrim and modeled after the Roman Pantheon.  The statue and Memorial Hall were designated as the Benjamin Franklin National Memorial in 1972.  It is the primary location memorializing Benjamin Franklin in the U.S.

Port Chicago Naval Magazine National Memorial: The Port Chicago Naval Magazine National Memorial is a memorial dedicated in 1994 recognizing the dead of the Port Chicago disaster, and the critical role played by Port Chicago, California during World War II, in serving as the main facility for the Pacific Theater of Operations.  The memorial is located at the Concord Naval Weapons Station near Concord, California, in the United States.

Andy DeComyn: British artist and sculptor born Worcestershire, England in 1966.  He is a practicing public artist whose most notable creation is the Shot at Dawn Memorial which is sited at the National Memorial Arboretum.  Other notable works include the Piper's Memorial at Longueval, the ATS Memorial at the National Memorial Arboretum, the SIGINTers Memorial at GCHQ and the Rugeley Miners Memorial.

Johnstown Flood National Memorial: Johnstown Flood National Memorial commemorates the approximately 2,200 people who died in the Johnstown Flood on May 31, 1889, caused by a break in the South Fork Dam, an earthen structure.  The memorial is located at 733 Lake Road near South Fork, Pennsylvania, about 10 miles (16 km) northeast of Johnstown.  The memorial preserves the remains of the dam and portions of the former Lake Conemaugh bed, along with the farm of Elias Unger and the clubhouse of the South Fork Fishing and Hunting Club which owned the dam and reservoir.  The United States Congress authorized the national memorial on August 31, 1964.

Mitt lille land: "Mitt lille land" (in English: "My Little Country" or "My Small Country" ) is a song by Ole Paus, written in 1994 as a lyrical description of Norway.  The song gained strong popularity following the 2011 Norway attacks, which led to it being described by the media as "the new national anthem."  According to the NRK, the song "came to symbolize the sorrow many people went through."  The song featured most prominently in all the memorial ceremonies following the attacks.  The NRK memorial concert (30 July 2011) following the attacks was named "Mitt lille land," and the concert opened with "Mitt lille land" sung by Maria Mena.  The national memorial ceremony (21 August 2011) was opened with "Mitt lille land" sung by Susanne Sundfør, followed by a speech by King Harald V.  On the Norwegian Constitution Day in 2012, the NRK broadcast was opened with "Mitt lille land."  The Norwegian People's Aid and Sony Music released a memorial album titled "Mitt lille land" and Gyldendal Norsk Forlag published a memorial book also titled "Mitt lille land" during the autumn of 2011.  Numerous Norwegian artists have recorded cover versions of this song, among them Sondre Bratland, Christine Guldbrandsen, Maria Solheim, Thomas Dybdahl, Mari Boine, Anne Grete Preus, Haddy N'jie, Kurt Nilsen, D.D.E., Sølvguttene, Tone Damli Aaberge and Maria Mena.

Supporting paragraphs: Port Chicago Naval Magazine National Memorial Port Chicago disaster
Answer: 320