(CNN) The World Bank has postponed its decision on granting Tanzania a $500 million loan, following pressure from activists who oppose the country's policy of banning pregnant girls and young mothers from attending state school.

The bank's executive board was meant to meet on Tuesday to consider the loan, but the meeting was postponed after one member requested a delay on Monday, a source at the bank told CNN.

Sources did not say why the meeting was postponed. However, the request to delay came in after the bank held a last-minute emergency meeting with Tanzanian activists and international human rights organizations earlier on Monday.

Last week, Tanzanian civil society groups sent a letter, seen by CNN, to the executive board urging them to stop the loan until the country passes a law that guarantees the rights of pregnant girls to attend regular secondary schools and ends mandatory pregnancy tests.

CNN visited three Tanzanian schools in 2018 where girls from grades eight and up were given compulsory pregnancy tests

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