The Portland City Clerk’s Office has found nearly 900 invalid signatures for a ballot initiative that would give noncitizens the right to vote in city elections. Most of the invalid signatures are from people who live outside Portland, said City Clerk Linda Cohen.

To get their proposal on the ballot, petitioners needed at least 4,487 valid signatures. On July 14, they submitted 5,110 signatures. But the City Clerk’s office found only 4,224 valid signatures.

To get on the ballot, the petitions now need an additional 263 valid signatures. State law provides petitioners an extra 10 days to gather those signatures.

The League of Young Voters, which is leading the effort, on Thursday took out enough papers to gather 500 signatures. The group has an Aug. 9 deadline to turn them into the clerk’s office.