The tests, due to last between six and 48 hours, will begin later on Tuesday on BP's newly installed "capping stack", which has a better seal than the last cap placed on the well and aims to stop oil from spewing out of the failed blowout preventer.
A critical test to gauge the integrity of the blown-out well is is expected to start "in a couple of hours," a BP executive said at about 3:30 p.m. EDT (1930 GMT).
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