Watford General Hospital asked people to stay away from the incident, which they said posed no risk to patients.
The NHS Trust at West Hertfordshire Hospitals said the problem was resolved at 10:30 p.m. Saturday.
The trust transferred patients to other hospitals in the area and tweeted to tell people not to go to A&E until further notice, even in an emergency.
Please DO NOT go to the Watford General emergency department until further notice, even in an emergency. Go to your next nearest hospital with an emergency department. Anyone with non-urgent problems should seek advice via https://t.co/3rSnMp3o5g
& mdash; West Herts Hospitals (@WestHertsNHS) April 4, 2020
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Rather, he advised people to visit other nearby hospitals or seek advice from the 111 hotline.
Assistant Executive Director Helen Brown said, “We know our NHS colleagues and the police are exceptionally busy right now, but that hasn’t stopped them from intervening to help. “
By 5 p.m. Thursday, 29 people had died in the West Hertfordshire NHS Trust hospitals after being diagnosed with Covid-19.
The trust is responsible for the Watford General hospitals as well as the Hemel Hampstead and St Albans City hospitals.