The House of Commons sitting has been suspended due to a roof leak above the press gallery.
MPs were distracted from a debate on the new Loan Charge when a large leak started in the ceiling of the Hous of Commons.
Conservative former minister Justine Greening was speaking when water began pouring from the ceiling.
A House of Commons spokesman said: "We are aware of a water leak on the estate and we're working urgently to resolve it."
Proceedings carried on for a few minutes, but the noise of water pouring into the press gallery soon became overwhelming.
The chamber was suspended after MPs began looking nervously at the torrent from the old rafters above.
Labour Whips claimed the leak could be "sewerage" but said they remained hopeful it was water.
Following Ms Greening's speech, Labour MP Justin Madders (Ellesmere Port and Neston) said: "I hope I can complete my speech before rain stops play.
"I think there is probably some kind of symbol about how many people view how broken our Parliament is."
Staff discussed whether to put out buckets, but it was decided this could make the noise from the leak even louder while MPs were trying to speak.