Sectarian clashes, a dismal feature of Egyptian life for more than a decade, have risen alarmingly.
There was a large police presence, following Monday's sectarian clashes, and two water canon vehicles arrived.
In the June clashes, sectarian clashes spread across the state, with houses of both Buddhists and Muslims being burnt down.
But sectarian clashes flared in Mazar-e-Sharif, where four people were killed when a bomb on a bicycle detonated near a Shiite mosque.
The fighting has raised concerns about the spread of sectarian clashes in Iraq, whose government is now dominated by the Shiite majority which Sunnis charge mistreats them.
Since the 1970s and 1980s - when there was a rise in extremist Islamist thought and Christian radicalism - there have been frequent sectarian clashes in Egypt.
Communal conflicts, which were heavily suppressed by the armed forces, have exploded violently and most gruesomely in the Molucca islands, where sectarian clashes have killed more than 3, 000 people in the past 18 months.
In Egypt, where the revolution featured heartwarming scenes of cohesion between Muslims and the 10% Coptic Christian minority, sectarian clashes have again erupted, with at least 13 killed in riots on the outskirts of Cairo.
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The blasts come amid a week-long spike in sectarian violence following clashes at a Sunni protest camp in the north of the country.
Sectarian and ethnic clashes have proved the biggest challenge to Mr. Thein Sein's administration since wide-scale violence erupted last year in the southwestern state of Rakhine, targeting Muslims from the ethnic Rohingya group.
Sectarian and ethnic clashes have proven the biggest challenge to Mr. Thein Sein's administration since widescale violence erupted last year in the southwestern state of Rakhine, targeting Muslims from the ethnic Rohingya group.
Violence there flared again on Sunday, with police reporting more sectarian fighting on the streets and clashes between police and youths.
The sectarian violence first began in western Rakhine state last year, when hundreds of people died in clashes between Buddhists and Muslims that drove about 140, 000 others, mostly Muslims, from their homes.
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