More than 1 million people have signed an online petition urging parliament to revoke Article 50 and prevent Brexit.
The call went viral after Theresa May's speech on Wednesday night, with the vast majority of signatures coming in less than 24 hours. The traffic has caused parliament's official petitions site to crash repeatedly on Thursday.
Between 80,000 and 100,000 people have been simultaneously viewing the petition, with nearly 2,000 signatures being completed every minute, the website said.
Several lawmakers have also urged people to add their names to the petition.
"An issue as big and important as Brexit should not come down to petitions -- that said, if you are frustrated that the PM is just not listening, you can sign here," SNP leader Nicola Sturgeon wrote on Twitter -- where #RevokeA50Now is the top trending topic in the UK.