Police officers inspect the debris at the Opera House in Mumbai
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Mumbai blasts: Indian cities on high alert

Mumbai and other Indian cities have woken up to a state of high alert after three blasts shook the commercial capital, killing 18 and hurting dozens.

No group has said it carried out the attacks, which took place in three districts during evening rush hour.

The attacks are the deadliest in Mumbai since November 2008 when 10 gunmen launched a three-day co-ordinated raid in which 166 people were killed.

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