Pakistan has recorded its highest number of polio cases for 14 years, with health officials blaming the rise on attacks on immunisation teams.

The number of new cases so far in 2014 is 202, already exceeding the previous the high of 199 cases in 2001.

Most of the infections are in the north-western tribal region where militants have targeted health teams.

Militants there accuse doctors of being spies and say the vaccinations are part of a Western plot to sterilise Muslims.

Since December 2012, about 60 people, including health workers and police providing security to medical teams, have been killed by Taliban militants targeting polio teams.

The BBC's Shaimaa Khalil in Islamabad says the rise in cases is hugely embarrassing to Pakistan.

The country has failed to curb the disease despite massive investment on immunisation programmes by the international community, she adds.

Pakistan is one of three countries where polio is endemic - the other two being Afghanistan and Nigeria.