Utilize the input text as a context reference, choose the right relationship between Afren and London from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Afren shares were suspended in London on July 15 after it said near-term production from its fields would likely be materially lower than expected.

Answer: headquarters_location